21213776168 has 32 divisors (see below), whose sum is σ = 42862179360. Its totient is φ = 9784877760.

The previous prime is 21213776159. The next prime is 21213776183. The reversal of 21213776168 is 86167731212.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 106523 + ... + 231893.

It is an arithmetic number, because the mean of its divisors is an integer number (1339443105).

Almost surely, 2^21213776168 is an apocalyptic number.

It is an amenable number.

21213776168 is an abundant number, since it is smaller than the sum of its proper divisors (21648403192).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21213776168 is a wasteful number, since it uses less digits than its factorization.

21213776168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127017 (or 127013 counting only the distinct ones).

The product of its digits is 169344, while the sum is 44.

The spelling of 21213776168 in words is "twenty-one billion, two hundred thirteen million, seven hundred seventy-six thousand, one hundred sixty-eight".