21522106889 has 2 divisors, whose sum is σ = 21522106890. Its totient is φ = 21522106888.

The previous prime is 21522106847. The next prime is 21522106891. The reversal of 21522106889 is 98860122512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21430617664 + 91489225 = 146392^2 + 9565^2 .

It is a cyclic number.

It is not a de Polignac number, because 21522106889 - 2²⁴ = 21505329673 is a prime.

Together with 21522106891, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21522108889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10761053444 + 10761053445.

It is an arithmetic number, because the mean of its divisors is an integer number (10761053445).

Almost surely, 2^21522106889 is an apocalyptic number.

It is an amenable number.

21522106889 is a deficient number, since it is larger than the sum of its proper divisors (1).

21522106889 is an equidigital number, since it uses as much as digits as its factorization.

21522106889 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 138240, while the sum is 44.

The spelling of 21522106889 in words is "twenty-one billion, five hundred twenty-two million, one hundred six thousand, eight hundred eighty-nine".