21395124 has 48 divisors (see below), whose sum is σ = 55720000. Its totient is φ = 7099488.

The previous prime is 21395117. The next prime is 21395131. The reversal of 21395124 is 42159312.

It is an interprime number because it is at equal distance from previous prime (21395117) and next prime (21395131).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42627 + ... + 43125.

Almost surely, 2^21395124 is an apocalyptic number.

It is an amenable number.

21395124 is an abundant number, since it is smaller than the sum of its proper divisors (34324876).

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

21395124 is a wasteful number, since it uses less digits than its factorization.

21395124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 909 (or 901 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 21395124 is about 4625.4863528066. The cubic root of 21395124 is about 277.6120219749.

The spelling of 21395124 in words is "twenty-one million, three hundred ninety-five thousand, one hundred twenty-four".