21624359251903 has 2 divisors, whose sum is σ = 21624359251904. Its totient is φ = 21624359251902.

The previous prime is 21624359251889. The next prime is 21624359251933. The reversal of 21624359251903 is 30915295342612.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21624359251903 is a prime.

It is a super-2 number, since 2×21624359251903² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21624359251933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10812179625951 + 10812179625952.

It is an arithmetic number, because the mean of its divisors is an integer number (10812179625952).

Almost surely, 2^{21624359251903} is an apocalyptic number.

21624359251903 is a deficient number, since it is larger than the sum of its proper divisors (1).

21624359251903 is an equidigital number, since it uses as much as digits as its factorization.

21624359251903 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3499200, while the sum is 52.

The spelling of 21624359251903 in words is "twenty-one trillion, six hundred twenty-four billion, three hundred fifty-nine million, two hundred fifty-one thousand, nine hundred three".