22521616 has 30 divisors (see below), whose sum is σ = 47256090. Its totient is φ = 10393344.

The previous prime is 22521607. The next prime is 22521619. The reversal of 22521616 is 61612522.

It can be written as a sum of positive squares in 3 ways, for example, as 992016 + 21529600 = 996^2 + 4640^2 .

It is not an unprimeable number, because it can be changed into a prime (22521619) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1461 + ... + 6868.

It is an arithmetic number, because the mean of its divisors is an integer number (1575203).

Almost surely, 2^22521616 is an apocalyptic number.

22521616 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

22521616 is an abundant number, since it is smaller than the sum of its proper divisors (24734474).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

22521616 is a wasteful number, since it uses less digits than its factorization.

22521616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8363 (or 8344 counting only the distinct ones).

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

The square root of 22521616 is about 4745.6944697273. The cubic root of 22521616 is about 282.4011861052.

The spelling of 22521616 in words is "twenty-two million, five hundred twenty-one thousand, six hundred sixteen".