21475532 has 24 divisors (see below), whose sum is σ = 40731936. Its totient is φ = 9848448.

The previous prime is 21475511. The next prime is 21475543. The reversal of 21475532 is 23557412.

It is a happy number.

It is a super-2 number, since 2×21475532² = 922396949366048, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21475495 and 21475504.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7448 + ... + 9920.

It is an arithmetic number, because the mean of its divisors is an integer number (1697164).

Almost surely, 2^21475532 is an apocalyptic number.

It is an amenable number.

21475532 is a deficient number, since it is larger than the sum of its proper divisors (19256404).

21475532 is a wasteful number, since it uses less digits than its factorization.

21475532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2657 (or 2655 counting only the distinct ones).

The product of its digits is 8400, while the sum is 29.

The square root of 21475532 is about 4634.1700443553. The cubic root of 21475532 is about 277.9593646936.

The spelling of 21475532 in words is "twenty-one million, four hundred seventy-five thousand, five hundred thirty-two".