21905026523 has 2 divisors, whose sum is σ = 21905026524. Its totient is φ = 21905026522.

The previous prime is 21905026501. The next prime is 21905026579. The reversal of 21905026523 is 32562050912.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21905026523 - 2⁸ = 21905026267 is a prime.

It is not a weakly prime, because it can be changed into another prime (81905026523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10952513261 + 10952513262.

It is an arithmetic number, because the mean of its divisors is an integer number (10952513262).

Almost surely, 2^21905026523 is an apocalyptic number.

21905026523 is a deficient number, since it is larger than the sum of its proper divisors (1).

21905026523 is an equidigital number, since it uses as much as digits as its factorization.

21905026523 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32400, while the sum is 35.

The spelling of 21905026523 in words is "twenty-one billion, nine hundred five million, twenty-six thousand, five hundred twenty-three".