21485992 has 16 divisors (see below), whose sum is σ = 43948800. Its totient is φ = 9766320.

The previous prime is 21485957. The next prime is 21485993. The reversal of 21485992 is 29958412.

It is not an unprimeable number, because it can be changed into a prime (21485993) 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 3 ways as a sum of consecutive naturals, for example, 121992 + ... + 122167.

It is an arithmetic number, because the mean of its divisors is an integer number (2746800).

Almost surely, 2^21485992 is an apocalyptic number.

21485992 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21485992 is an abundant number, since it is smaller than the sum of its proper divisors (22462808).

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

21485992 is a wasteful number, since it uses less digits than its factorization.

21485992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244176 (or 244172 counting only the distinct ones).

The product of its digits is 51840, while the sum is 40.

The square root of 21485992 is about 4635.2984801413. The cubic root of 21485992 is about 278.0044855478.

The spelling of 21485992 in words is "twenty-one million, four hundred eighty-five thousand, nine hundred ninety-two".