21475392 has 56 divisors (see below), whose sum is σ = 58375296. Its totient is φ = 6962688.

The previous prime is 21475387. The next prime is 21475393. The reversal of 21475392 is 29357412.

It is a super-2 number, since 2×21475392² = 922384923107328, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (21475393) 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, 5593 + ... + 8615.

It is an arithmetic number, because the mean of its divisors is an integer number (1042416).

Almost surely, 2^21475392 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21475392, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29187648).

21475392 is an abundant number, since it is smaller than the sum of its proper divisors (36899904).

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

21475392 is a wasteful number, since it uses less digits than its factorization.

21475392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3075 (or 3065 counting only the distinct ones).

The product of its digits is 15120, while the sum is 33.

The square root of 21475392 is about 4634.1549391448. The cubic root of 21475392 is about 277.9587606823.

The spelling of 21475392 in words is "twenty-one million, four hundred seventy-five thousand, three hundred ninety-two".