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21010000000000 = 21051011191
BaseRepresentation
bin1001100011011110001011…
…00101100011010000000000
32202101112111000122120021011
410301233011211203100000
510223211440000000000
6112403505531210304
74265631246252604
oct461570545432000
982345430576234
1021010000000000
1167703222a7a40
122433a665a6994
13b95308269a2b
14528c64827504
152667b94aa2ba
hex131bc5963400

21010000000000 has 484 divisors, whose sum is σ = 57571873820928. Its totient is φ = 7600000000000.

The previous prime is 21009999999931. The next prime is 21010000000019. The reversal of 21010000000000 is 1012.

Adding to 21010000000000 its reverse (1012), we get a palindrome (21010000001012).

It is a Harshad number since it is a multiple of its sum of digits (4).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 43 ways as a sum of consecutive naturals, for example, 109999999905 + ... + 110000000095.

Almost surely, 221010000000000 is an apocalyptic number.

21010000000000 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 21010000000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28785936910464).

21010000000000 is an abundant number, since it is smaller than the sum of its proper divisors (36561873820928).

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

21010000000000 is an frugal number, since it uses more digits than its factorization.

21010000000000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272 (or 209 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 4.

The spelling of 21010000000000 in words is "twenty-one trillion, ten billion", and thus it is an aban number and an uban number.