121122220211121 has 4 divisors (see below), whose sum is σ = 161496293614832. Its totient is φ = 80748146807412.

The previous prime is 121122220211101. The next prime is 121122220211141. The reversal of 121122220211121 is 121112022221121.

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 an interprime number because it is at equal distance from previous prime (121122220211101) and next prime (121122220211141).

It is not a de Polignac number, because 121122220211121 - 2¹⁹ = 121122219686833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121122220211101) 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, 20187036701851 + ... + 20187036701856.

It is an arithmetic number, because the mean of its divisors is an integer number (40374073403708).

Almost surely, 2^{121122220211121} is an apocalyptic number.

It is an amenable number.

121122220211121 is a deficient number, since it is larger than the sum of its proper divisors (40374073403711).

121122220211121 is an equidigital number, since it uses as much as digits as its factorization.

121122220211121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40374073403710.

The product of its (nonzero) digits is 128, while the sum is 21.

Adding to 121122220211121 its reverse (121112022221121), we get a palindrome (242234242432242).

The spelling of 121122220211121 in words is "one hundred twenty-one trillion, one hundred twenty-two billion, two hundred twenty million, two hundred eleven thousand, one hundred twenty-one".