121021022121 has 4 divisors (see below), whose sum is σ = 161361362832. Its totient is φ = 80680681412.

The previous prime is 121021022107. The next prime is 121021022131. The reversal of 121021022121 is 121220120121.

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: 121220120121 = 3 ⋅40406706707.

It is a cyclic number.

It is not a de Polignac number, because 121021022121 - 2¹⁰ = 121021021097 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121021022121.

It is not an unprimeable number, because it can be changed into a prime (121021022131) 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, 20170170351 + ... + 20170170356.

It is an arithmetic number, because the mean of its divisors is an integer number (40340340708).

Almost surely, 2^121021022121 is an apocalyptic number.

It is an amenable number.

121021022121 is a deficient number, since it is larger than the sum of its proper divisors (40340340711).

121021022121 is an equidigital number, since it uses as much as digits as its factorization.

121021022121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40340340710.

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

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

The spelling of 121021022121 in words is "one hundred twenty-one billion, twenty-one million, twenty-two thousand, one hundred twenty-one".