21475156 has 12 divisors (see below), whose sum is σ = 37615060. Its totient is φ = 10728000.

The previous prime is 21475151. The next prime is 21475159. The reversal of 21475156 is 65157412.

It can be written as a sum of positive squares in 2 ways, for example, as 16679056 + 4796100 = 4084^2 + 2190^2 .

It is a super-2 number, since 2×21475156² = 922364650448672, which contains 22 as substring.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21475151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5656 + ... + 8656.

Almost surely, 2^21475156 is an apocalyptic number.

It is an amenable number.

21475156 is a deficient number, since it is larger than the sum of its proper divisors (16139904).

21475156 is a wasteful number, since it uses less digits than its factorization.

21475156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4794 (or 4792 counting only the distinct ones).

The product of its digits is 8400, while the sum is 31.

The square root of 21475156 is about 4634.1294759642. The cubic root of 21475156 is about 277.9577424857.

The spelling of 21475156 in words is "twenty-one million, four hundred seventy-five thousand, one hundred fifty-six".