21476256 has 24 divisors (see below), whose sum is σ = 56375424. Its totient is φ = 7158720.

The previous prime is 21476207. The next prime is 21476261. The reversal of 21476256 is 65267412.

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×21476256² = 922459143555072, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 111760 + ... + 111951.

It is an arithmetic number, because the mean of its divisors is an integer number (2348976).

Almost surely, 2^21476256 is an apocalyptic number.

It is an amenable number.

21476256 is an abundant number, since it is smaller than the sum of its proper divisors (34899168).

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

21476256 is a wasteful number, since it uses less digits than its factorization.

21476256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223724 (or 223716 counting only the distinct ones).

The product of its digits is 20160, while the sum is 33.

The square root of 21476256 is about 4634.2481590869. The cubic root of 21476256 is about 277.9624882533.

The spelling of 21476256 in words is "twenty-one million, four hundred seventy-six thousand, two hundred fifty-six".