21679876 has 6 divisors (see below), whose sum is σ = 37939790. Its totient is φ = 10839936.

The previous prime is 21679871. The next prime is 21679897. The reversal of 21679876 is 67897612.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 15054400 + 6625476 = 3880^2 + 2574^2 .

It is not an unprimeable number, because it can be changed into a prime (21679871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2709981 + ... + 2709988.

Almost surely, 2^21679876 is an apocalyptic number.

It is an amenable number.

21679876 is a deficient number, since it is larger than the sum of its proper divisors (16259914).

21679876 is a wasteful number, since it uses less digits than its factorization.

21679876 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5419973 (or 5419971 counting only the distinct ones).

The product of its digits is 254016, while the sum is 46.

The square root of 21679876 is about 4656.1653750699. The cubic root of 21679876 is about 278.8381961999.

The spelling of 21679876 in words is "twenty-one million, six hundred seventy-nine thousand, eight hundred seventy-six".