21456892 has 24 divisors (see below), whose sum is σ = 38936016. Its totient is φ = 10338048.

The previous prime is 21456889. The next prime is 21456893. The reversal of 21456892 is 29865412.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21456893) 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, 16083 + ... + 17365.

It is an arithmetic number, because the mean of its divisors is an integer number (1622334).

Almost surely, 2^21456892 is an apocalyptic number.

It is an amenable number.

21456892 is a deficient number, since it is larger than the sum of its proper divisors (17479124).

21456892 is a wasteful number, since it uses less digits than its factorization.

21456892 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1437 (or 1435 counting only the distinct ones).

The product of its digits is 34560, while the sum is 37.

The square root of 21456892 is about 4632.1584601566. The cubic root of 21456892 is about 277.8789217923.

The spelling of 21456892 in words is "twenty-one million, four hundred fifty-six thousand, eight hundred ninety-two".