121220120121 has 4 divisors (see below), whose sum is σ = 161626826832. Its totient is φ = 80813413412.

The previous prime is 121220120107. The next prime is 121220120159. The reversal of 121220120121 is 121021022121.

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: 121021022121 = 3 ⋅40340340707.

It is a cyclic number.

It is not a de Polignac number, because 121220120121 - 2¹¹ = 121220118073 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121220120121.

It is not an unprimeable number, because it can be changed into a prime (121220120521) 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, 20203353351 + ... + 20203353356.

It is an arithmetic number, because the mean of its divisors is an integer number (40406706708).

Almost surely, 2^121220120121 is an apocalyptic number.

It is an amenable number.

121220120121 is a deficient number, since it is larger than the sum of its proper divisors (40406706711).

121220120121 is an equidigital number, since it uses as much as digits as its factorization.

121220120121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40406706710.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 121220120121 its reverse (121021022121), we get a palindrome (242241142242).

The spelling of 121220120121 in words is "one hundred twenty-one billion, two hundred twenty million, one hundred twenty thousand, one hundred twenty-one".