21478676 has 12 divisors (see below), whose sum is σ = 38884020. Its totient is φ = 10368960.

The previous prime is 21478669. The next prime is 21478679. The reversal of 21478676 is 67687412.

It can be written as a sum of positive squares in 2 ways, for example, as 9060100 + 12418576 = 3010^2 + 3524^2 .

It is a super-2 number, since 2×21478676² = 922667045425952, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21478679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 92465 + ... + 92696.

It is an arithmetic number, because the mean of its divisors is an integer number (3240335).

Almost surely, 2^21478676 is an apocalyptic number.

It is an amenable number.

21478676 is a deficient number, since it is larger than the sum of its proper divisors (17405344).

21478676 is a wasteful number, since it uses less digits than its factorization.

21478676 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185194 (or 185192 counting only the distinct ones).

The product of its digits is 112896, while the sum is 41.

The square root of 21478676 is about 4634.5092512584. The cubic root of 21478676 is about 277.9729283716.

The spelling of 21478676 in words is "twenty-one million, four hundred seventy-eight thousand, six hundred seventy-six".