21995036 has 12 divisors (see below), whose sum is σ = 43990128. Its totient is φ = 9426432.

The previous prime is 21995033. The next prime is 21995063. The reversal of 21995036 is 63059912.

21995036 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 21994987 and 21995005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21995033) 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, 392741 + ... + 392796.

It is an arithmetic number, because the mean of its divisors is an integer number (3665844).

Almost surely, 2^21995036 is an apocalyptic number.

It is an amenable number.

21995036 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21995036 is a wasteful number, since it uses less digits than its factorization.

21995036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 785548 (or 785546 counting only the distinct ones).

The product of its (nonzero) digits is 14580, while the sum is 35.

The square root of 21995036 is about 4689.8865657924. The cubic root of 21995036 is about 280.1828567481.

The spelling of 21995036 in words is "twenty-one million, nine hundred ninety-five thousand, thirty-six".