22315921 has 4 divisors (see below), whose sum is σ = 22919092. Its totient is φ = 21712752.

The previous prime is 22315919. The next prime is 22315927. The reversal of 22315921 is 12951322.

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 11662225 + 10653696 = 3415^2 + 3264^2 .

It is a cyclic number.

It is not a de Polignac number, because 22315921 - 2¹ = 22315919 is a prime.

It is a super-3 number, since 3×22315921³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22315927) 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, 301530 + ... + 301603.

It is an arithmetic number, because the mean of its divisors is an integer number (5729773).

Almost surely, 2^22315921 is an apocalyptic number.

It is an amenable number.

22315921 is a deficient number, since it is larger than the sum of its proper divisors (603171).

22315921 is an equidigital number, since it uses as much as digits as its factorization.

22315921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 603170.

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

The square root of 22315921 is about 4723.9730100838. The cubic root of 22315921 is about 281.5388107476.

The spelling of 22315921 in words is "twenty-two million, three hundred fifteen thousand, nine hundred twenty-one".