21534364 has 6 divisors (see below), whose sum is σ = 37685144. Its totient is φ = 10767180.

The previous prime is 21534349. The next prime is 21534397. The reversal of 21534364 is 46343512.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2691792 + ... + 2691799.

Almost surely, 2^21534364 is an apocalyptic number.

It is an amenable number.

21534364 is a deficient number, since it is larger than the sum of its proper divisors (16150780).

21534364 is a wasteful number, since it uses less digits than its factorization.

21534364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5383595 (or 5383593 counting only the distinct ones).

The product of its digits is 8640, while the sum is 28.

The square root of 21534364 is about 4640.5133336733. The cubic root of 21534364 is about 278.2129555423.

Adding to 21534364 its reverse (46343512), we get a palindrome (67877876).

The spelling of 21534364 in words is "twenty-one million, five hundred thirty-four thousand, three hundred sixty-four".