21212114856 has 16 divisors (see below), whose sum is σ = 53030287200. Its totient is φ = 7070704944.

The previous prime is 21212114813. The next prime is 21212114879. The reversal of 21212114856 is 65841121212.

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, 441919036 + ... + 441919083.

It is an arithmetic number, because the mean of its divisors is an integer number (3314392950).

Almost surely, 2^21212114856 is an apocalyptic number.

It is an amenable number.

21212114856 is an abundant number, since it is smaller than the sum of its proper divisors (31818172344).

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

21212114856 is a wasteful number, since it uses less digits than its factorization.

21212114856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 883838128 (or 883838124 counting only the distinct ones).

The product of its digits is 7680, while the sum is 33.

The spelling of 21212114856 in words is "twenty-one billion, two hundred twelve million, one hundred fourteen thousand, eight hundred fifty-six".