21676372 has 12 divisors (see below), whose sum is σ = 38859156. Its totient is φ = 10573760.

The previous prime is 21676367. The next prime is 21676387. The reversal of 21676372 is 27367612.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 3048516 + 18627856 = 1746^2 + 4316^2 .

It is a congruent number.

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, 65923 + ... + 66250.

It is an arithmetic number, because the mean of its divisors is an integer number (3238263).

Almost surely, 2^21676372 is an apocalyptic number.

It is an amenable number.

21676372 is a deficient number, since it is larger than the sum of its proper divisors (17182784).

21676372 is a wasteful number, since it uses less digits than its factorization.

21676372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132218 (or 132216 counting only the distinct ones).

The product of its digits is 21168, while the sum is 34.

The square root of 21676372 is about 4655.7890845699. The cubic root of 21676372 is about 278.8231730253.

The spelling of 21676372 in words is "twenty-one million, six hundred seventy-six thousand, three hundred seventy-two".