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21261021523040 = 25513151193350741
BaseRepresentation
bin1001101010110001101111…
…01000101010110001100000
32210021112102010221011120002
410311120313220222301200
510241320033002214130
6113115102313435132
74323025635064625
oct465306750526140
983245363834502
1021261021523040
116857826415602
12247464110baa8
13bb2ba0b60510
14537078b8a34c
1526d0abd07b45
hex135637a2ac60

21261021523040 has 192 divisors, whose sum is σ = 54733463068032. Its totient is φ = 7757807616000.

The previous prime is 21261021522989. The next prime is 21261021523081. The reversal of 21261021523040 is 4032512016212.

It is a junction number, because it is equal to n+sod(n) for n = 21261021522994 and 21261021523012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 60442070 + ... + 60792810.

It is an arithmetic number, because the mean of its divisors is an integer number (285070120146).

Almost surely, 221261021523040 is an apocalyptic number.

21261021523040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21261021523040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27366731534016).

21261021523040 is an abundant number, since it is smaller than the sum of its proper divisors (33472441544992).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21261021523040 is a wasteful number, since it uses less digits than its factorization.

21261021523040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 351113 (or 351105 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

Adding to 21261021523040 its reverse (4032512016212), we get a palindrome (25293533539252).

The spelling of 21261021523040 in words is "twenty-one trillion, two hundred sixty-one billion, twenty-one million, five hundred twenty-three thousand, forty".