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21661465732411 = 40275379057793
BaseRepresentation
bin1001110110011011100111…
…11110000110010100111011
32211200211000210100201020211
410323031303332012110323
510314400140211414121
6114023050122531551
74363663212516661
oct473156376062473
984624023321224
1021661465732411
1169a1637768a8a
12251a179066bb7
13c1188a51b92b
1454c5c5d40c31
152786e76e8ce1
hex13b373f8653b

21661465732411 has 4 divisors (see below), whose sum is σ = 21666844794232. Its totient is φ = 21656086670592.

The previous prime is 21661465732391. The next prime is 21661465732429. The reversal of 21661465732411 is 11423756416612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-21661465732411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21661465732811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2689524870 + ... + 2689532923.

It is an arithmetic number, because the mean of its divisors is an integer number (5416711198558).

Almost surely, 221661465732411 is an apocalyptic number.

21661465732411 is a deficient number, since it is larger than the sum of its proper divisors (5379061821).

21661465732411 is an equidigital number, since it uses as much as digits as its factorization.

21661465732411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5379061820.

The product of its digits is 1451520, while the sum is 49.

The spelling of 21661465732411 in words is "twenty-one trillion, six hundred sixty-one billion, four hundred sixty-five million, seven hundred thirty-two thousand, four hundred eleven".

Divisors: 1 4027 5379057793 21661465732411