21655032604291 has 2 divisors, whose sum is σ = 21655032604292. Its totient is φ = 21655032604290.

The previous prime is 21655032604229. The next prime is 21655032604297. The reversal of 21655032604291 is 19240623055612.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21655032604291 is a prime.

It is a super-2 number, since 2×21655032604291² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21655032604297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10827516302145 + 10827516302146.

It is an arithmetic number, because the mean of its divisors is an integer number (10827516302146).

Almost surely, 2^{21655032604291} is an apocalyptic number.

21655032604291 is a deficient number, since it is larger than the sum of its proper divisors (1).

21655032604291 is an equidigital number, since it uses as much as digits as its factorization.

21655032604291 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 777600, while the sum is 46.

The spelling of 21655032604291 in words is "twenty-one trillion, six hundred fifty-five billion, thirty-two million, six hundred four thousand, two hundred ninety-one".