21369936 has 40 divisors (see below), whose sum is σ = 63093184. Its totient is φ = 6105600.

The previous prime is 21369917. The next prime is 21369937. The reversal of 21369936 is 63996312.

It is a junction number, because it is equal to n+sod(n) for n = 21369894 and 21369903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21369937) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31465 + ... + 32136.

Almost surely, 2^21369936 is an apocalyptic number.

It is an amenable number.

21369936 is an abundant number, since it is smaller than the sum of its proper divisors (41723248).

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

21369936 is a wasteful number, since it uses less digits than its factorization.

21369936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63619 (or 63613 counting only the distinct ones).

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

The square root of 21369936 is about 4622.7628102683. The cubic root of 21369936 is about 277.5030370579.

The spelling of 21369936 in words is "twenty-one million, three hundred sixty-nine thousand, nine hundred thirty-six".