21359396 has 12 divisors (see below), whose sum is σ = 37652748. Its totient is φ = 10601472.

The previous prime is 21359389. The next prime is 21359413. The reversal of 21359396 is 69395312.

It can be written as a sum of positive squares in 2 ways, for example, as 6071296 + 15288100 = 2464^2 + 3910^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18941 + ... + 20036.

It is an arithmetic number, because the mean of its divisors is an integer number (3137729).

Almost surely, 2^21359396 is an apocalyptic number.

It is an amenable number.

21359396 is a deficient number, since it is larger than the sum of its proper divisors (16293352).

21359396 is a wasteful number, since it uses less digits than its factorization.

21359396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39118 (or 39116 counting only the distinct ones).

The product of its digits is 43740, while the sum is 38.

The square root of 21359396 is about 4621.6226587639. The cubic root of 21359396 is about 277.4574065514.

The spelling of 21359396 in words is "twenty-one million, three hundred fifty-nine thousand, three hundred ninety-six".