22139521 has 2 divisors, whose sum is σ = 22139522. Its totient is φ = 22139520.

The previous prime is 22139483. The next prime is 22139527. The reversal of 22139521 is 12593122.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15713296 + 6426225 = 3964^2 + 2535^2 .

It is a cyclic number.

It is not a de Polignac number, because 22139521 - 2¹⁵ = 22106753 is a prime.

It is not a weakly prime, because it can be changed into another prime (22139527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11069760 + 11069761.

It is an arithmetic number, because the mean of its divisors is an integer number (11069761).

Almost surely, 2^22139521 is an apocalyptic number.

It is an amenable number.

22139521 is a deficient number, since it is larger than the sum of its proper divisors (1).

22139521 is an equidigital number, since it uses as much as digits as its factorization.

22139521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1080, while the sum is 25.

The square root of 22139521 is about 4705.2652422579. The cubic root of 22139521 is about 280.7950236603.

The spelling of 22139521 in words is "twenty-two million, one hundred thirty-nine thousand, five hundred twenty-one".