21476913 has 4 divisors (see below), whose sum is σ = 28635888. Its totient is φ = 14317940.

The previous prime is 21476891. The next prime is 21476921. The reversal of 21476913 is 31967412.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21476913 - 2⁸ = 21476657 is a prime.

It is a super-2 number, since 2×21476913² = 922515584019138, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21476953) 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, 3579483 + ... + 3579488.

It is an arithmetic number, because the mean of its divisors is an integer number (7158972).

Almost surely, 2^21476913 is an apocalyptic number.

It is an amenable number.

21476913 is a deficient number, since it is larger than the sum of its proper divisors (7158975).

21476913 is an equidigital number, since it uses as much as digits as its factorization.

21476913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7158974.

The product of its digits is 9072, while the sum is 33.

The square root of 21476913 is about 4634.3190438294. The cubic root of 21476913 is about 277.9653226935.

The spelling of 21476913 in words is "twenty-one million, four hundred seventy-six thousand, nine hundred thirteen".