21394492 has 12 divisors (see below), whose sum is σ = 42789040. Its totient is φ = 9169056.

The previous prime is 21394459. The next prime is 21394519. The reversal of 21394492 is 29449312.

21394492 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 382017 + ... + 382072.

Almost surely, 2^21394492 is an apocalyptic number.

It is an amenable number.

21394492 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.

21394492 is a wasteful number, since it uses less digits than its factorization.

21394492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 764100 (or 764098 counting only the distinct ones).

The product of its digits is 15552, while the sum is 34.

The square root of 21394492 is about 4625.4180351618. The cubic root of 21394492 is about 277.6092884467.

The spelling of 21394492 in words is "twenty-one million, three hundred ninety-four thousand, four hundred ninety-two".