21191211102 has 32 divisors (see below), whose sum is σ = 43195507200. Its totient is φ = 6929223840.

The previous prime is 21191211047. The next prime is 21191211149. The reversal of 21191211102 is 20111219112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40213 + ... + 209760.

It is an arithmetic number, because the mean of its divisors is an integer number (1349859600).

Almost surely, 2^21191211102 is an apocalyptic number.

21191211102 is an abundant number, since it is smaller than the sum of its proper divisors (22004296098).

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

21191211102 is a wasteful number, since it uses less digits than its factorization.

21191211102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250248.

The product of its (nonzero) digits is 72, while the sum is 21.

The spelling of 21191211102 in words is "twenty-one billion, one hundred ninety-one million, two hundred eleven thousand, one hundred two".