21476344 has 16 divisors (see below), whose sum is σ = 40527000. Its totient is φ = 10669152.

The previous prime is 21476341. The next prime is 21476353. The reversal of 21476344 is 44367412.

It is a super-2 number, since 2×21476344² = 922466703212672, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21476341) 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, 7294 + ... + 9805.

Almost surely, 2^21476344 is an apocalyptic number.

It is an amenable number.

21476344 is a deficient number, since it is larger than the sum of its proper divisors (19050656).

21476344 is a wasteful number, since it uses less digits than its factorization.

21476344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17262 (or 17258 counting only the distinct ones).

The product of its digits is 16128, while the sum is 31.

The square root of 21476344 is about 4634.2576536054. The cubic root of 21476344 is about 277.9628679077.

The spelling of 21476344 in words is "twenty-one million, four hundred seventy-six thousand, three hundred forty-four".