22239521 has 4 divisors (see below), whose sum is σ = 22381332. Its totient is φ = 22097712.

The previous prime is 22239517. The next prime is 22239533. The reversal of 22239521 is 12593222.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12593222 = 2 ⋅6296611.

It can be written as a sum of positive squares in 2 ways, for example, as 11316496 + 10923025 = 3364^2 + 3305^2 .

It is a cyclic number.

It is not a de Polignac number, because 22239521 - 2² = 22239517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22239541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70670 + ... + 70983.

It is an arithmetic number, because the mean of its divisors is an integer number (5595333).

Almost surely, 2^22239521 is an apocalyptic number.

It is an amenable number.

22239521 is a deficient number, since it is larger than the sum of its proper divisors (141811).

22239521 is a wasteful number, since it uses less digits than its factorization.

22239521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141810.

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

The square root of 22239521 is about 4715.8796634350. The cubic root of 22239521 is about 281.2171546170.

The spelling of 22239521 in words is "twenty-two million, two hundred thirty-nine thousand, five hundred twenty-one".