21479084 has 12 divisors (see below), whose sum is σ = 41005608. Its totient is φ = 9763200.

The previous prime is 21479083. The next prime is 21479093. The reversal of 21479084 is 48097412.

It is a super-2 number, since 2×21479084² = 922702098958112, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21479083) 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, 244037 + ... + 244124.

It is an arithmetic number, because the mean of its divisors is an integer number (3417134).

Almost surely, 2^21479084 is an apocalyptic number.

It is an amenable number.

21479084 is a deficient number, since it is larger than the sum of its proper divisors (19526524).

21479084 is a wasteful number, since it uses less digits than its factorization.

21479084 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 488176 (or 488174 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 21479084 is about 4634.5532686549. The cubic root of 21479084 is about 277.9746884465.

The spelling of 21479084 in words is "twenty-one million, four hundred seventy-nine thousand, eighty-four".