21894492 has 24 divisors (see below), whose sum is σ = 52334352. Its totient is φ = 7120000.

The previous prime is 21894443. The next prime is 21894493. The reversal of 21894492 is 29449812.

It is a self number, because there is not a number n which added to its sum of digits gives 21894492.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21894493) 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, 21759 + ... + 22742.

It is an arithmetic number, because the mean of its divisors is an integer number (2180598).

Almost surely, 2^21894492 is an apocalyptic number.

It is an amenable number.

21894492 is an abundant number, since it is smaller than the sum of its proper divisors (30439860).

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

21894492 is a wasteful number, since it uses less digits than its factorization.

21894492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44549 (or 44547 counting only the distinct ones).

The product of its digits is 41472, while the sum is 39.

The square root of 21894492 is about 4679.1550519298. The cubic root of 21894492 is about 279.7552793732.

The spelling of 21894492 in words is "twenty-one million, eight hundred ninety-four thousand, four hundred ninety-two".