120111221021 has 4 divisors (see below), whose sum is σ = 131030422944. Its totient is φ = 109192019100.

The previous prime is 120111220981. The next prime is 120111221039. The reversal of 120111221021 is 120122111021.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-120111221021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 120111220987 and 120111221005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120111221051) 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, 5459600945 + ... + 5459600966.

It is an arithmetic number, because the mean of its divisors is an integer number (32757605736).

Almost surely, 2^120111221021 is an apocalyptic number.

120111221021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

120111221021 is a deficient number, since it is larger than the sum of its proper divisors (10919201923).

120111221021 is a wasteful number, since it uses less digits than its factorization.

120111221021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10919201922.

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

Adding to 120111221021 its reverse (120122111021), we get a palindrome (240233332042).

Subtracting 120111221021 from its reverse (120122111021), we obtain a square (10890000 = 3300²).

The spelling of 120111221021 in words is "one hundred twenty billion, one hundred eleven million, two hundred twenty-one thousand, twenty-one".