21134877668 has 12 divisors (see below), whose sum is σ = 37012483200. Its totient is φ = 10559882472.

The previous prime is 21134877641. The next prime is 21134877713. The reversal of 21134877668 is 86677843112.

It is a happy 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, 1882796 + ... + 1893987.

It is an arithmetic number, because the mean of its divisors is an integer number (3084373600).

Almost surely, 2^21134877668 is an apocalyptic number.

It is an amenable number.

21134877668 is a deficient number, since it is larger than the sum of its proper divisors (15877605532).

21134877668 is a wasteful number, since it uses less digits than its factorization.

21134877668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3778186 (or 3778184 counting only the distinct ones).

The product of its digits is 2709504, while the sum is 53.

The spelling of 21134877668 in words is "twenty-one billion, one hundred thirty-four million, eight hundred seventy-seven thousand, six hundred sixty-eight".