21475568 has 10 divisors (see below), whose sum is σ = 41608944. Its totient is φ = 10737776.

The previous prime is 21475549. The next prime is 21475579. The reversal of 21475568 is 86557412.

It is a super-2 number, since 2×21475568² = 922400041845248, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 671096 + ... + 671127.

Almost surely, 2^21475568 is an apocalyptic number.

It is an amenable number.

21475568 is a deficient number, since it is larger than the sum of its proper divisors (20133376).

21475568 is a wasteful number, since it uses less digits than its factorization.

21475568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1342231 (or 1342225 counting only the distinct ones).

The product of its digits is 67200, while the sum is 38.

The square root of 21475568 is about 4634.1739285443. The cubic root of 21475568 is about 277.9595200104.

The spelling of 21475568 in words is "twenty-one million, four hundred seventy-five thousand, five hundred sixty-eight".