21624211031551 has 2 divisors, whose sum is σ = 21624211031552. Its totient is φ = 21624211031550.

The previous prime is 21624211031503. The next prime is 21624211031561. The reversal of 21624211031551 is 15513011242612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21624211031551 - 2³⁵ = 21589851293183 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21624211031561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10812105515775 + 10812105515776.

It is an arithmetic number, because the mean of its divisors is an integer number (10812105515776).

Almost surely, 2^{21624211031551} is an apocalyptic number.

21624211031551 is a deficient number, since it is larger than the sum of its proper divisors (1).

21624211031551 is an equidigital number, since it uses as much as digits as its factorization.

21624211031551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14400, while the sum is 34.

The spelling of 21624211031551 in words is "twenty-one trillion, six hundred twenty-four billion, two hundred eleven million, thirty-one thousand, five hundred fifty-one".