21879683330 has 24 divisors (see below), whose sum is σ = 39769698492. Its totient is φ = 8666861664.

The previous prime is 21879683323. The next prime is 21879683359. The reversal of 21879683330 is 3338697812.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 19999333561 + 1880349769 = 141419^2 + 43363^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2972 + ... + 209208.

Almost surely, 2^21879683330 is an apocalyptic number.

21879683330 is a deficient number, since it is larger than the sum of its proper divisors (17890015162).

21879683330 is a wasteful number, since it uses less digits than its factorization.

21879683330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206450 (or 206347 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 50.

The spelling of 21879683330 in words is "twenty-one billion, eight hundred seventy-nine million, six hundred eighty-three thousand, three hundred thirty".