1111122022121 has 4 divisors (see below), whose sum is σ = 1111435282512. Its totient is φ = 1110808761732.

The previous prime is 1111122022111. The next prime is 1111122022141. The reversal of 1111122022121 is 1212202211111.

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-1111122022121 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1111122022121.

It is not an unprimeable number, because it can be changed into a prime (1111122022111) 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, 156624875 + ... + 156631968.

It is an arithmetic number, because the mean of its divisors is an integer number (277858820628).

Almost surely, 2^{1111122022121} is an apocalyptic number.

It is an amenable number.

1111122022121 is a deficient number, since it is larger than the sum of its proper divisors (313260391).

1111122022121 is an equidigital number, since it uses as much as digits as its factorization.

1111122022121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313260390.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 1111122022121 its reverse (1212202211111), we get a palindrome (2323324233232).

The spelling of 1111122022121 in words is "one trillion, one hundred eleven billion, one hundred twenty-two million, twenty-two thousand, one hundred twenty-one".