22515012 has 36 divisors (see below), whose sum is σ = 61292140. Its totient is φ = 6927552.

The previous prime is 22515011. The next prime is 22515013. The reversal of 22515012 is 21051522.

It is an interprime number because it is at equal distance from previous prime (22515011) and next prime (22515013).

It can be written as a sum of positive squares in 2 ways, for example, as 7584516 + 14930496 = 2754^2 + 3864^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (22515011) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23587 + ... + 24522.

Almost surely, 2^22515012 is an apocalyptic number.

It is an amenable number.

22515012 is an abundant number, since it is smaller than the sum of its proper divisors (38777128).

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

22515012 is a wasteful number, since it uses less digits than its factorization.

22515012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48132 (or 48127 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 22515012 is about 4744.9986301368. The cubic root of 22515012 is about 282.3735806297.

Adding to 22515012 its reverse (21051522), we get a palindrome (43566534).

The spelling of 22515012 in words is "twenty-two million, five hundred fifteen thousand, twelve".