21083536 has 20 divisors (see below), whose sum is σ = 43252812. Its totient is φ = 9921536.

The previous prime is 21083449. The next prime is 21083537. The reversal of 21083536 is 63538012.

It can be written as a sum of positive squares in 2 ways, for example, as 18662400 + 2421136 = 4320^2 + 1556^2 .

It is not an unprimeable number, because it can be changed into a prime (21083537) 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, 38485 + ... + 39028.

Almost surely, 2^21083536 is an apocalyptic number.

It is an amenable number.

21083536 is an abundant number, since it is smaller than the sum of its proper divisors (22169276).

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

21083536 is a wasteful number, since it uses less digits than its factorization.

21083536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77538 (or 77532 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 21083536 is about 4591.6811736008. The cubic root of 21083536 is about 276.2577582228.

The spelling of 21083536 in words is "twenty-one million, eighty-three thousand, five hundred thirty-six".