21476740 has 12 divisors (see below), whose sum is σ = 45101196. Its totient is φ = 8590688.

The previous prime is 21476731. The next prime is 21476747. The reversal of 21476740 is 4767412.

It can be written as a sum of positive squares in 2 ways, for example, as 8386816 + 13089924 = 2896^2 + 3618^2 .

It is a super-2 number, since 2×21476740² = 922500722055200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21476747) 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, 536899 + ... + 536938.

It is an arithmetic number, because the mean of its divisors is an integer number (3758433).

Almost surely, 2^21476740 is an apocalyptic number.

21476740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21476740 is an abundant number, since it is smaller than the sum of its proper divisors (23624456).

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

21476740 is a wasteful number, since it uses less digits than its factorization.

21476740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1073846 (or 1073844 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 31.

The square root of 21476740 is about 4634.3003786980. The cubic root of 21476740 is about 277.9645763397.

The spelling of 21476740 in words is "twenty-one million, four hundred seventy-six thousand, seven hundred forty".