111210220121 has 64 divisors (see below), whose sum is σ = 153045312000. Its totient is φ = 79634016000.

The previous prime is 111210220111. The next prime is 111210220151. The reversal of 111210220121 is 121022012111.

It is not a de Polignac number, because 111210220121 - 2¹⁰ = 111210219097 is a prime.

It is a super-2 number, since 2×111210220121² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 111210220096 and 111210220105.

It is not an unprimeable number, because it can be changed into a prime (111210220111) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 11227271 + ... + 11237171.

It is an arithmetic number, because the mean of its divisors is an integer number (2391333000).

Almost surely, 2^111210220121 is an apocalyptic number.

111210220121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

111210220121 is a deficient number, since it is larger than the sum of its proper divisors (41835091879).

111210220121 is a wasteful number, since it uses less digits than its factorization.

111210220121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10175 (or 10161 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 111210220121 its reverse (121022012111), we get a palindrome (232232232232).

It can be divided in two parts, 11 and 1210220121, that multiplied together give a palindrome (13312421331).

The spelling of 111210220121 in words is "one hundred eleven billion, two hundred ten million, two hundred twenty thousand, one hundred twenty-one".