21101166505212 has 24 divisors (see below), whose sum is σ = 49237359432912. Its totient is φ = 7033535846400.

The previous prime is 21101166505147. The next prime is 21101166505229. The reversal of 21101166505212 is 21250566110112.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22817989 + ... + 23724732.

It is an arithmetic number, because the mean of its divisors is an integer number (2051556643038).

Almost surely, 2^{21101166505212} is an apocalyptic number.

It is an amenable number.

21101166505212 is an abundant number, since it is smaller than the sum of its proper divisors (28136192927700).

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

21101166505212 is a wasteful number, since it uses less digits than its factorization.

21101166505212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46580509 (or 46580507 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 33.

The spelling of 21101166505212 in words is "twenty-one trillion, one hundred one billion, one hundred sixty-six million, five hundred five thousand, two hundred twelve".