121512052465 has 16 divisors (see below), whose sum is σ = 146232054288. Its totient is φ = 96931650816.

The previous prime is 121512052457. The next prime is 121512052469. The reversal of 121512052465 is 564250215121.

It can be written as a sum of positive squares in 8 ways, for example, as 12128396641 + 109383655824 = 110129^2 + 330732^2 .

It is a cyclic number.

It is not a de Polignac number, because 121512052465 - 2³ = 121512052457 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121512052465.

It is not an unprimeable number, because it can be changed into a prime (121512052469) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2456719 + ... + 2505691.

It is an arithmetic number, because the mean of its divisors is an integer number (9139503393).

Almost surely, 2^121512052465 is an apocalyptic number.

It is an amenable number.

121512052465 is a deficient number, since it is larger than the sum of its proper divisors (24720001823).

121512052465 is an equidigital number, since it uses as much as digits as its factorization.

121512052465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50388.

The product of its (nonzero) digits is 24000, while the sum is 34.

Adding to 121512052465 its reverse (564250215121), we get a palindrome (685762267586).

The spelling of 121512052465 in words is "one hundred twenty-one billion, five hundred twelve million, fifty-two thousand, four hundred sixty-five".