21902755457573 has 2 divisors, whose sum is σ = 21902755457574. Its totient is φ = 21902755457572.

The previous prime is 21902755457567. The next prime is 21902755457629. The reversal of 21902755457573 is 37575455720912.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18375428235649 + 3527327221924 = 4286657^2 + 1878118^2 .

It is a cyclic number.

It is not a de Polignac number, because 21902755457573 - 2²⁴ = 21902738680357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21902755457543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10951377728786 + 10951377728787.

It is an arithmetic number, because the mean of its divisors is an integer number (10951377728787).

Almost surely, 2^{21902755457573} is an apocalyptic number.

It is an amenable number.

21902755457573 is a deficient number, since it is larger than the sum of its proper divisors (1).

21902755457573 is an equidigital number, since it uses as much as digits as its factorization.

21902755457573 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 92610000, while the sum is 62.

The spelling of 21902755457573 in words is "twenty-one trillion, nine hundred two billion, seven hundred fifty-five million, four hundred fifty-seven thousand, five hundred seventy-three".