21344422889 has 2 divisors, whose sum is σ = 21344422890. Its totient is φ = 21344422888.

The previous prime is 21344422829. The next prime is 21344422943. The reversal of 21344422889 is 98822444312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20010931600 + 1333491289 = 141460^2 + 36517^2 .

It is a cyclic number.

It is not a de Polignac number, because 21344422889 - 2⁸ = 21344422633 is a prime.

It is not a weakly prime, because it can be changed into another prime (21344422829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10672211444 + 10672211445.

It is an arithmetic number, because the mean of its divisors is an integer number (10672211445).

Almost surely, 2^21344422889 is an apocalyptic number.

It is an amenable number.

21344422889 is a deficient number, since it is larger than the sum of its proper divisors (1).

21344422889 is an equidigital number, since it uses as much as digits as its factorization.

21344422889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 884736, while the sum is 47.

The spelling of 21344422889 in words is "twenty-one billion, three hundred forty-four million, four hundred twenty-two thousand, eight hundred eighty-nine".