2121221110110 has 16 divisors (see below), whose sum is σ = 5090930664336. Its totient is φ = 565658962688.

The previous prime is 2121221110093. The next prime is 2121221110117. The reversal of 2121221110110 is 110111221212.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 2121221110110.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121221110117) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35353685139 + ... + 35353685198.

It is an arithmetic number, because the mean of its divisors is an integer number (318183166521).

Almost surely, 2^{2121221110110} is an apocalyptic number.

2121221110110 is an abundant number, since it is smaller than the sum of its proper divisors (2969709554226).

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

2121221110110 is a wasteful number, since it uses less digits than its factorization.

2121221110110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70707370347.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 2121221110110 its reverse (110111221212), we get a palindrome (2231332331322).

The spelling of 2121221110110 in words is "two trillion, one hundred twenty-one billion, two hundred twenty-one million, one hundred ten thousand, one hundred ten".