21676712 has 8 divisors (see below), whose sum is σ = 40643850. Its totient is φ = 10838352.

The previous prime is 21676703. The next prime is 21676747. The reversal of 21676712 is 21767612.

It can be written as a sum of positive squares in only one way, i.e., 20124196 + 1552516 = 4486^2 + 1246^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1354787 + ... + 1354802.

Almost surely, 2^21676712 is an apocalyptic number.

It is an amenable number.

21676712 is a deficient number, since it is larger than the sum of its proper divisors (18967138).

21676712 is a wasteful number, since it uses less digits than its factorization.

21676712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2709595 (or 2709591 counting only the distinct ones).

The product of its digits is 7056, while the sum is 32.

The square root of 21676712 is about 4655.8255981082. The cubic root of 21676712 is about 278.8246308244.

The spelling of 21676712 in words is "twenty-one million, six hundred seventy-six thousand, seven hundred twelve".