21401492 has 12 divisors (see below), whose sum is σ = 42803040. Its totient is φ = 9172056.

The previous prime is 21401473. The next prime is 21401531. The reversal of 21401492 is 29410412.

21401492 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, 382142 + ... + 382197.

It is an arithmetic number, because the mean of its divisors is an integer number (3566920).

Almost surely, 2^21401492 is an apocalyptic number.

It is an amenable number.

21401492 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.

21401492 is a wasteful number, since it uses less digits than its factorization.

21401492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 764350 (or 764348 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 21401492 is about 4626.1746616400. The cubic root of 21401492 is about 277.6395618635.

The spelling of 21401492 in words is "twenty-one million, four hundred one thousand, four hundred ninety-two".