21611173320451 has 64 divisors (see below), whose sum is σ = 26881761392640. Its totient is φ = 17098804800000.

The previous prime is 21611173320427. The next prime is 21611173320461. The reversal of 21611173320451 is 15402337111612.

It is not a de Polignac number, because 21611173320451 - 2³⁷ = 21473734366979 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21611173320451.

It is not an unprimeable number, because it can be changed into a prime (21611173320461) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 980932806 + ... + 980954836.

It is an arithmetic number, because the mean of its divisors is an integer number (420027521760).

Almost surely, 2^{21611173320451} is an apocalyptic number.

21611173320451 is a deficient number, since it is larger than the sum of its proper divisors (5270588072189).

21611173320451 is a wasteful number, since it uses less digits than its factorization.

21611173320451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27628.

The product of its (nonzero) digits is 30240, while the sum is 37.

The spelling of 21611173320451 in words is "twenty-one trillion, six hundred eleven billion, one hundred seventy-three million, three hundred twenty thousand, four hundred fifty-one".