21111405111210 has 64 divisors (see below), whose sum is σ = 50871269320704. Its totient is φ = 5607054600000.

The previous prime is 21111405111187. The next prime is 21111405111221. The reversal of 21111405111210 is 1211150411112.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 283143435 + ... + 283217985.

It is an arithmetic number, because the mean of its divisors is an integer number (794863583136).

Almost surely, 2^{21111405111210} is an apocalyptic number.

21111405111210 is an abundant number, since it is smaller than the sum of its proper divisors (29759864209494).

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

21111405111210 is a wasteful number, since it uses less digits than its factorization.

21111405111210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112419.

The product of its (nonzero) digits is 80, while the sum is 21.

Adding to 21111405111210 its reverse (1211150411112), we get a palindrome (22322555522322).

The spelling of 21111405111210 in words is "twenty-one trillion, one hundred eleven billion, four hundred five million, one hundred eleven thousand, two hundred ten".