111101220121 has 4 divisors (see below), whose sum is σ = 111114381312. Its totient is φ = 111088058932.

The previous prime is 111101220101. The next prime is 111101220133. The reversal of 111101220121 is 121022101111.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 121022101111 = 19 ⋅6369584269.

It is a cyclic number.

It is not a de Polignac number, because 111101220121 - 2¹⁷ = 111101089049 is a prime.

It is a super-2 number, since 2×111101220121² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111101220101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6567925 + ... + 6584818.

It is an arithmetic number, because the mean of its divisors is an integer number (27778595328).

Almost surely, 2^111101220121 is an apocalyptic number.

It is an amenable number.

111101220121 is a deficient number, since it is larger than the sum of its proper divisors (13161191).

111101220121 is an equidigital number, since it uses as much as digits as its factorization.

111101220121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13161190.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 111101220121 its reverse (121022101111), we get a palindrome (232123321232).

The spelling of 111101220121 in words is "one hundred eleven billion, one hundred one million, two hundred twenty thousand, one hundred twenty-one".