21476216 has 8 divisors (see below), whose sum is σ = 40267920. Its totient is φ = 10738104.

The previous prime is 21476207. The next prime is 21476261. The reversal of 21476216 is 61267412.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×21476216² = 922455707357312, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1342256 + ... + 1342271.

It is an arithmetic number, because the mean of its divisors is an integer number (5033490).

Almost surely, 2^21476216 is an apocalyptic number.

It is an amenable number.

21476216 is a deficient number, since it is larger than the sum of its proper divisors (18791704).

21476216 is a wasteful number, since it uses less digits than its factorization.

21476216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2684533 (or 2684529 counting only the distinct ones).

The product of its digits is 4032, while the sum is 29.

The square root of 21476216 is about 4634.2438433902. The cubic root of 21476216 is about 277.9623156828.

The spelling of 21476216 in words is "twenty-one million, four hundred seventy-six thousand, two hundred sixteen".