21425492 has 12 divisors (see below), whose sum is σ = 40903296. Its totient is φ = 9738840.

The previous prime is 21425477. The next prime is 21425497. The reversal of 21425492 is 29452412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21425497) 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, 243428 + ... + 243515.

It is an arithmetic number, because the mean of its divisors is an integer number (3408608).

Almost surely, 2^21425492 is an apocalyptic number.

21425492 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21425492 is a deficient number, since it is larger than the sum of its proper divisors (19477804).

21425492 is a wasteful number, since it uses less digits than its factorization.

21425492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 486958 (or 486956 counting only the distinct ones).

The product of its digits is 5760, while the sum is 29.

The square root of 21425492 is about 4628.7678706109. The cubic root of 21425492 is about 277.7433063476.

The spelling of 21425492 in words is "twenty-one million, four hundred twenty-five thousand, four hundred ninety-two".