21395384 has 32 divisors (see below), whose sum is σ = 43189200. Its totient is φ = 9899520.

The previous prime is 21395383. The next prime is 21395393. The reversal of 21395384 is 48359312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21395383) 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, 7007 + ... + 9585.

Almost surely, 2^21395384 is an apocalyptic number.

It is an amenable number.

21395384 is an abundant number, since it is smaller than the sum of its proper divisors (21793816).

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

21395384 is a wasteful number, since it uses less digits than its factorization.

21395384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2663 (or 2659 counting only the distinct ones).

The product of its digits is 25920, while the sum is 35.

The square root of 21395384 is about 4625.5144578738. The cubic root of 21395384 is about 277.6131465120.

The spelling of 21395384 in words is "twenty-one million, three hundred ninety-five thousand, three hundred eighty-four".