121200020100121 has 4 divisors (see below), whose sum is σ = 121200824012544. Its totient is φ = 121199216187700.

The previous prime is 121200020100113. The next prime is 121200020100127. The reversal of 121200020100121 is 121001020002121.

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 121200020100121 - 2³ = 121200020100113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121200020100127) 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, 401730025 + ... + 402031606.

It is an arithmetic number, because the mean of its divisors is an integer number (30300206003136).

Almost surely, 2^{121200020100121} is an apocalyptic number.

It is an amenable number.

121200020100121 is a deficient number, since it is larger than the sum of its proper divisors (803912423).

121200020100121 is an equidigital number, since it uses as much as digits as its factorization.

121200020100121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 803912422.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 121200020100121 its reverse (121001020002121), we get a palindrome (242201040102242).

The spelling of 121200020100121 in words is "one hundred twenty-one trillion, two hundred billion, twenty million, one hundred thousand, one hundred twenty-one".