21479882 has 4 divisors (see below), whose sum is σ = 32219826. Its totient is φ = 10739940.

The previous prime is 21479881. The next prime is 21479911. The reversal of 21479882 is 28897412.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 19351201 + 2128681 = 4399^2 + 1459^2 .

It is a super-2 number, since 2×21479882² = 922770661467848, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21479881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5369969 + ... + 5369972.

Almost surely, 2^21479882 is an apocalyptic number.

21479882 is a deficient number, since it is larger than the sum of its proper divisors (10739944).

21479882 is a wasteful number, since it uses less digits than its factorization.

21479882 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10739943.

The product of its digits is 64512, while the sum is 41.

The square root of 21479882 is about 4634.6393602955. The cubic root of 21479882 is about 277.9781308815.

The spelling of 21479882 in words is "twenty-one million, four hundred seventy-nine thousand, eight hundred eighty-two".