22521329 has 2 divisors, whose sum is σ = 22521330. Its totient is φ = 22521328.

The previous prime is 22521299. The next prime is 22521337. The reversal of 22521329 is 92312522.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19562929 + 2958400 = 4423^2 + 1720^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22521329 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22521298 and 22521307.

It is not a weakly prime, because it can be changed into another prime (22521349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11260664 + 11260665.

It is an arithmetic number, because the mean of its divisors is an integer number (11260665).

Almost surely, 2^22521329 is an apocalyptic number.

It is an amenable number.

22521329 is a deficient number, since it is larger than the sum of its proper divisors (1).

22521329 is an equidigital number, since it uses as much as digits as its factorization.

22521329 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2160, while the sum is 26.

The square root of 22521329 is about 4745.6642316961. The cubic root of 22521329 is about 282.3999865245.

The spelling of 22521329 in words is "twenty-two million, five hundred twenty-one thousand, three hundred twenty-nine".