121111022220121 has 4 divisors (see below), whose sum is σ = 125017829388544. Its totient is φ = 117204215051700.

The previous prime is 121111022220091. The next prime is 121111022220157. The reversal of 121111022220121 is 121022220111121.

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 not a de Polignac number, because 121111022220121 - 2²¹ = 121111020122969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121111022224121) 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, 1953403584165 + ... + 1953403584226.

It is an arithmetic number, because the mean of its divisors is an integer number (31254457347136).

Almost surely, 2^{121111022220121} is an apocalyptic number.

It is an amenable number.

121111022220121 is a deficient number, since it is larger than the sum of its proper divisors (3906807168423).

121111022220121 is an equidigital number, since it uses as much as digits as its factorization.

121111022220121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3906807168422.

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

Adding to 121111022220121 its reverse (121022220111121), we get a palindrome (242133242331242).

The spelling of 121111022220121 in words is "one hundred twenty-one trillion, one hundred eleven billion, twenty-two million, two hundred twenty thousand, one hundred twenty-one".