21536364 has 12 divisors (see below), whose sum is σ = 50251544. Its totient is φ = 7178784.

The previous prime is 21536353. The next prime is 21536369. The reversal of 21536364 is 46363512.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (21536369) 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, 897337 + ... + 897360.

Almost surely, 2^21536364 is an apocalyptic number.

It is an amenable number.

21536364 is an abundant number, since it is smaller than the sum of its proper divisors (28715180).

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

21536364 is a wasteful number, since it uses less digits than its factorization.

21536364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1794704 (or 1794702 counting only the distinct ones).

The product of its digits is 12960, while the sum is 30.

The square root of 21536364 is about 4640.7288220709. The cubic root of 21536364 is about 278.2215682676.

Adding to 21536364 its reverse (46363512), we get a palindrome (67899876).

The spelling of 21536364 in words is "twenty-one million, five hundred thirty-six thousand, three hundred sixty-four".