121112199965 has 4 divisors (see below), whose sum is σ = 145334639964. Its totient is φ = 96889759968.

The previous prime is 121112199931. The next prime is 121112199979. The reversal of 121112199965 is 569991211121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 569991211121 = 29 ⋅19654869349.

It can be written as a sum of positive squares in 2 ways, for example, as 64429161241 + 56683038724 = 253829^2 + 238082^2 .

It is a cyclic number.

It is not a de Polignac number, because 121112199965 - 2³² = 116817232669 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12111219992 + ... + 12111220001.

It is an arithmetic number, because the mean of its divisors is an integer number (36333659991).

Almost surely, 2^121112199965 is an apocalyptic number.

It is an amenable number.

121112199965 is a deficient number, since it is larger than the sum of its proper divisors (24222439999).

121112199965 is an equidigital number, since it uses as much as digits as its factorization.

121112199965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24222439998.

The product of its digits is 87480, while the sum is 47.

The spelling of 121112199965 in words is "one hundred twenty-one billion, one hundred twelve million, one hundred ninety-nine thousand, nine hundred sixty-five".