21369396 has 24 divisors (see below), whose sum is σ = 50924160. Its totient is φ = 6971392.

The previous prime is 21369389. The next prime is 21369407. The reversal of 21369396 is 69396312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18381 + ... + 19508.

It is an arithmetic number, because the mean of its divisors is an integer number (2121840).

Almost surely, 2^21369396 is an apocalyptic number.

It is an amenable number.

21369396 is an abundant number, since it is smaller than the sum of its proper divisors (29554764).

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

21369396 is a wasteful number, since it uses less digits than its factorization.

21369396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37943 (or 37941 counting only the distinct ones).

The product of its digits is 52488, while the sum is 39.

The square root of 21369396 is about 4622.7044032687. The cubic root of 21369396 is about 277.5006996168.

The spelling of 21369396 in words is "twenty-one million, three hundred sixty-nine thousand, three hundred ninety-six".