20110102111221 has 16 divisors (see below), whose sum is σ = 28393591906368. Its totient is φ = 12616832390400.

The previous prime is 20110102111213. The next prime is 20110102111303. The reversal of 20110102111221 is 12211120101102.

It is a happy number.

It is not a de Polignac number, because 20110102111221 - 2³ = 20110102111213 is a prime.

It is a super-2 number, since 2×20110102111221² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20110102111221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20110102111201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19346290 + ... + 20359251.

It is an arithmetic number, because the mean of its divisors is an integer number (1774599494148).

Almost surely, 2^{20110102111221} is an apocalyptic number.

It is an amenable number.

20110102111221 is a deficient number, since it is larger than the sum of its proper divisors (8283489795147).

20110102111221 is a wasteful number, since it uses less digits than its factorization.

20110102111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39715492.

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

Adding to 20110102111221 its reverse (12211120101102), we get a palindrome (32321222212323).

The spelling of 20110102111221 in words is "twenty trillion, one hundred ten billion, one hundred two million, one hundred eleven thousand, two hundred twenty-one".