1121221122121 has 4 divisors (see below), whose sum is σ = 1121257599952. Its totient is φ = 1121184644292.

The previous prime is 1121221122103. The next prime is 1121221122137. The reversal of 1121221122121 is 1212211221211.

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.

It is a cyclic number.

It is not a de Polignac number, because 1121221122121 - 2¹⁵ = 1121221089353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1121221122221) 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, 18192771 + ... + 18254296.

It is an arithmetic number, because the mean of its divisors is an integer number (280314399988).

Almost surely, 2^{1121221122121} is an apocalyptic number.

It is an amenable number.

1121221122121 is a deficient number, since it is larger than the sum of its proper divisors (36477831).

1121221122121 is an equidigital number, since it uses as much as digits as its factorization.

1121221122121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36477830.

The product of its digits is 64, while the sum is 19.

Adding to 1121221122121 its reverse (1212211221211), we get a palindrome (2333432343332).

The spelling of 1121221122121 in words is "one trillion, one hundred twenty-one billion, two hundred twenty-one million, one hundred twenty-two thousand, one hundred twenty-one".