21889112957 has 2 divisors, whose sum is σ = 21889112958. Its totient is φ = 21889112956.

The previous prime is 21889112951. The next prime is 21889112981. The reversal of 21889112957 is 75921198812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21724991236 + 164121721 = 147394^2 + 12811^2 .

It is a cyclic number.

It is not a de Polignac number, because 21889112957 - 2⁶ = 21889112893 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21889112899 and 21889112908.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21889112951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10944556478 + 10944556479.

It is an arithmetic number, because the mean of its divisors is an integer number (10944556479).

Almost surely, 2^21889112957 is an apocalyptic number.

It is an amenable number.

21889112957 is a deficient number, since it is larger than the sum of its proper divisors (1).

21889112957 is an equidigital number, since it uses as much as digits as its factorization.

21889112957 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 725760, while the sum is 53.

The spelling of 21889112957 in words is "twenty-one billion, eight hundred eighty-nine million, one hundred twelve thousand, nine hundred fifty-seven".