22513921 has 4 divisors (see below), whose sum is σ = 22526532. Its totient is φ = 22501312.

The previous prime is 22513919. The next prime is 22513951. The reversal of 22513921 is 12931522.

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 10817521 + 11696400 = 3289^2 + 3420^2 .

It is a cyclic number.

It is not a de Polignac number, because 22513921 - 2¹ = 22513919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22513901) 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, 3076 + ... + 7381.

It is an arithmetic number, because the mean of its divisors is an integer number (5631633).

Almost surely, 2^22513921 is an apocalyptic number.

It is an amenable number.

22513921 is a deficient number, since it is larger than the sum of its proper divisors (12611).

22513921 is a wasteful number, since it uses less digits than its factorization.

22513921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12610.

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

The square root of 22513921 is about 4744.8836655918. The cubic root of 22513921 is about 282.3690196054.

The spelling of 22513921 in words is "twenty-two million, five hundred thirteen thousand, nine hundred twenty-one".