21492888 has 32 divisors (see below), whose sum is σ = 54043200. Its totient is φ = 7122848.

The previous prime is 21492883. The next prime is 21492937. The reversal of 21492888 is 88829412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21492881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1795 + ... + 6797.

It is an arithmetic number, because the mean of its divisors is an integer number (1688850).

Almost surely, 2^21492888 is an apocalyptic number.

It is an amenable number.

21492888 is an abundant number, since it is smaller than the sum of its proper divisors (32550312).

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

21492888 is a wasteful number, since it uses less digits than its factorization.

21492888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5191 (or 5187 counting only the distinct ones).

The product of its digits is 73728, while the sum is 42.

The square root of 21492888 is about 4636.0422776329. The cubic root of 21492888 is about 278.0342245186.

The spelling of 21492888 in words is "twenty-one million, four hundred ninety-two thousand, eight hundred eighty-eight".