22521229 has 2 divisors, whose sum is σ = 22521230. Its totient is φ = 22521228.

The previous prime is 22521223. The next prime is 22521263. The reversal of 22521229 is 92212522.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16281225 + 6240004 = 4035^2 + 2498^2 .

It is a cyclic number.

It is not a de Polignac number, because 22521229 - 2⁷ = 22521101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22521223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11260614 + 11260615.

It is an arithmetic number, because the mean of its divisors is an integer number (11260615).

Almost surely, 2^22521229 is an apocalyptic number.

It is an amenable number.

22521229 is a deficient number, since it is larger than the sum of its proper divisors (1).

22521229 is an equidigital number, since it uses as much as digits as its factorization.

22521229 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1440, while the sum is 25.

The square root of 22521229 is about 4745.6536957515. The cubic root of 22521229 is about 282.3995685498.

It can be divided in two parts, 2252 and 1229, that added together give a square (3481 = 59²).

The spelling of 22521229 in words is "twenty-two million, five hundred twenty-one thousand, two hundred twenty-nine".