21475488 has 48 divisors (see below), whose sum is σ = 59693760. Its totient is φ = 6736896.

The previous prime is 21475459. The next prime is 21475499. The reversal of 21475488 is 88457412.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×21475488² = 922393169676288, which contains 22 as substring.

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, 4948 + ... + 8211.

It is an arithmetic number, because the mean of its divisors is an integer number (1243620).

Almost surely, 2^21475488 is an apocalyptic number.

It is an amenable number.

21475488 is an abundant number, since it is smaller than the sum of its proper divisors (38218272).

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

21475488 is a wasteful number, since it uses less digits than its factorization.

21475488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13189 (or 13181 counting only the distinct ones).

The product of its digits is 71680, while the sum is 39.

The square root of 21475488 is about 4634.1652970087. The cubic root of 21475488 is about 277.9591748618.

The spelling of 21475488 in words is "twenty-one million, four hundred seventy-five thousand, four hundred eighty-eight".