21995084 has 24 divisors (see below), whose sum is σ = 42282240. Its totient is φ = 9964944.

The previous prime is 21995063. The next prime is 21995087. The reversal of 21995084 is 48059912.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21995087) 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, 4544 + ... + 8039.

It is an arithmetic number, because the mean of its divisors is an integer number (1761760).

Almost surely, 2^21995084 is an apocalyptic number.

It is an amenable number.

21995084 is a deficient number, since it is larger than the sum of its proper divisors (20287156).

21995084 is a wasteful number, since it uses less digits than its factorization.

21995084 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12629 (or 12627 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 38.

The square root of 21995084 is about 4689.8916831842. The cubic root of 21995084 is about 280.1830605633.

The spelling of 21995084 in words is "twenty-one million, nine hundred ninety-five thousand, eighty-four".