121765512 has 32 divisors (see below), whose sum is σ = 332088480. Its totient is φ = 36898560.

The previous prime is 121765507. The next prime is 121765517. The reversal of 121765512 is 215567121.

It is an interprime number because it is at equal distance from previous prime (121765507) and next prime (121765517).

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 121765512.

It is not an unprimeable number, because it can be changed into a prime (121765517) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 230353 + ... + 230880.

It is an arithmetic number, because the mean of its divisors is an integer number (10377765).

Almost surely, 2^121765512 is an apocalyptic number.

121765512 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

121765512 is an abundant number, since it is smaller than the sum of its proper divisors (210322968).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121765512 is a wasteful number, since it uses less digits than its factorization.

121765512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 461253 (or 461249 counting only the distinct ones).

The product of its digits is 4200, while the sum is 30.

The square root of 121765512 is about 11034.7411387853. The cubic root of 121765512 is about 495.6496072799.

The spelling of 121765512 in words is "one hundred twenty-one million, seven hundred sixty-five thousand, five hundred twelve".