21902100388423 has 2 divisors, whose sum is σ = 21902100388424. Its totient is φ = 21902100388422.

The previous prime is 21902100388411. The next prime is 21902100388453. The reversal of 21902100388423 is 32488300120912.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21902100388423 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21902100388423.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21902100388453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10951050194211 + 10951050194212.

It is an arithmetic number, because the mean of its divisors is an integer number (10951050194212).

Almost surely, 2^{21902100388423} is an apocalyptic number.

21902100388423 is a deficient number, since it is larger than the sum of its proper divisors (1).

21902100388423 is an equidigital number, since it uses as much as digits as its factorization.

21902100388423 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 165888, while the sum is 43.

The spelling of 21902100388423 in words is "twenty-one trillion, nine hundred two billion, one hundred million, three hundred eighty-eight thousand, four hundred twenty-three".