121012199965 has 4 divisors (see below), whose sum is σ = 145214639964. Its totient is φ = 96809759968.

The previous prime is 121012199953. The next prime is 121012199969. The reversal of 121012199965 is 569991210121.

121012199965 is digitally balanced in base 11, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 91423383769 + 29588816196 = 302363^2 + 172014^2 .

It is a cyclic number.

It is not a de Polignac number, because 121012199965 - 2⁵ = 121012199933 is a prime.

It is a Duffinian number.

121012199965 is strictly pandigital in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121012199969) 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, 12101219992 + ... + 12101220001.

It is an arithmetic number, because the mean of its divisors is an integer number (36303659991).

Almost surely, 2^121012199965 is an apocalyptic number.

It is an amenable number.

121012199965 is a deficient number, since it is larger than the sum of its proper divisors (24202439999).

121012199965 is an equidigital number, since it uses as much as digits as its factorization.

121012199965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24202439998.

The product of its (nonzero) digits is 87480, while the sum is 46.

The spelling of 121012199965 in words is "one hundred twenty-one billion, twelve million, one hundred ninety-nine thousand, nine hundred sixty-five".