121323120465 has 32 divisors (see below), whose sum is σ = 206246960640. Its totient is φ = 60899411712.

The previous prime is 121323120461. The next prime is 121323120497. The reversal of 121323120465 is 564021323121.

It is not a de Polignac number, because 121323120465 - 2² = 121323120461 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121323120461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 749449 + ... + 896838.

It is an arithmetic number, because the mean of its divisors is an integer number (6445217520).

Almost surely, 2^121323120465 is an apocalyptic number.

121323120465 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121323120465 is a deficient number, since it is larger than the sum of its proper divisors (84923840175).

121323120465 is an equidigital number, since it uses as much as digits as its factorization.

121323120465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1646346 (or 1646312 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 30.

Adding to 121323120465 its reverse (564021323121), we get a palindrome (685344443586).

The spelling of 121323120465 in words is "one hundred twenty-one billion, three hundred twenty-three million, one hundred twenty thousand, four hundred sixty-five".