21995736 has 32 divisors (see below), whose sum is σ = 62845440. Its totient is φ = 6284448.

The previous prime is 21995713. The next prime is 21995759. The reversal of 21995736 is 63759912.

It is an interprime number because it is at equal distance from previous prime (21995713) and next prime (21995759).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65296 + ... + 65631.

It is an arithmetic number, because the mean of its divisors is an integer number (1963920).

Almost surely, 2^21995736 is an apocalyptic number.

It is an amenable number.

21995736 is an abundant number, since it is smaller than the sum of its proper divisors (40849704).

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

21995736 is a wasteful number, since it uses less digits than its factorization.

21995736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130943 (or 130939 counting only the distinct ones).

The product of its digits is 102060, while the sum is 42.

The square root of 21995736 is about 4689.9611938693. The cubic root of 21995736 is about 280.1858290236.

The spelling of 21995736 in words is "twenty-one million, nine hundred ninety-five thousand, seven hundred thirty-six".