22921513 has 4 divisors (see below), whose sum is σ = 23711940. Its totient is φ = 22131088.

The previous prime is 22921511. The next prime is 22921601. The reversal of 22921513 is 31512922.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6985449 + 15936064 = 2643^2 + 3992^2 .

It is a cyclic number.

It is not a de Polignac number, because 22921513 - 2¹ = 22921511 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22921511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 395170 + ... + 395227.

It is an arithmetic number, because the mean of its divisors is an integer number (5927985).

Almost surely, 2^22921513 is an apocalyptic number.

It is an amenable number.

22921513 is a deficient number, since it is larger than the sum of its proper divisors (790427).

22921513 is an equidigital number, since it uses as much as digits as its factorization.

22921513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 790426.

The product of its digits is 1080, while the sum is 25.

The square root of 22921513 is about 4787.6416950311. The cubic root of 22921513 is about 284.0628415127.

The spelling of 22921513 in words is "twenty-two million, nine hundred twenty-one thousand, five hundred thirteen".