21039183045681 has 16 divisors (see below), whose sum is σ = 28095328977408. Its totient is φ = 14004580550400.

The previous prime is 21039183045619. The next prime is 21039183045707. The reversal of 21039183045681 is 18654038193012.

It is not a de Polignac number, because 21039183045681 - 2¹⁸ = 21039182783537 is a prime.

It is a super-2 number, since 2×21039183045681² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21039183045281) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 112284985 + ... + 112472201.

It is an arithmetic number, because the mean of its divisors is an integer number (1755958061088).

Almost surely, 2^{21039183045681} is an apocalyptic number.

It is an amenable number.

21039183045681 is a deficient number, since it is larger than the sum of its proper divisors (7056145931727).

21039183045681 is a wasteful number, since it uses less digits than its factorization.

21039183045681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244552.

The product of its (nonzero) digits is 1244160, while the sum is 51.

The spelling of 21039183045681 in words is "twenty-one trillion, thirty-nine billion, one hundred eighty-three million, forty-five thousand, six hundred eighty-one".