21937036 has 24 divisors (see below), whose sum is σ = 42416640. Its totient is φ = 9843600.

The previous prime is 21937031. The next prime is 21937049. The reversal of 21937036 is 63073912.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 21936989 and 21937007.

It is not an unprimeable number, because it can be changed into a prime (21937031) 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, 321 + ... + 6631.

It is an arithmetic number, because the mean of its divisors is an integer number (1767360).

Almost surely, 2^21937036 is an apocalyptic number.

It is an amenable number.

21937036 is a deficient number, since it is larger than the sum of its proper divisors (20479604).

21937036 is a wasteful number, since it uses less digits than its factorization.

21937036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6405 (or 6403 counting only the distinct ones).

The product of its (nonzero) digits is 6804, while the sum is 31.

The square root of 21937036 is about 4683.6989655613. The cubic root of 21937036 is about 279.9363630891.

It can be divided in two parts, 2193 and 7036, that added together give a palindrome (9229).

The spelling of 21937036 in words is "twenty-one million, nine hundred thirty-seven thousand, thirty-six".