121512315 has 32 divisors (see below), whose sum is σ = 209664000. Its totient is φ = 59892480.

The previous prime is 121512299. The next prime is 121512317. The reversal of 121512315 is 513215121.

It is not a de Polignac number, because 121512315 - 2⁴ = 121512299 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121512291 and 121512300.

It is not an unprimeable number, because it can be changed into a prime (121512317) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6486 + ... + 16884.

It is an arithmetic number, because the mean of its divisors is an integer number (6552000).

Almost surely, 2^121512315 is an apocalyptic number.

121512315 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

121512315 is a deficient number, since it is larger than the sum of its proper divisors (88151685).

121512315 is a wasteful number, since it uses less digits than its factorization.

121512315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10467.

The product of its digits is 300, while the sum is 21.

The square root of 121512315 is about 11023.2624481140. The cubic root of 121512315 is about 495.3058206100.

Adding to 121512315 its reverse (513215121), we get a palindrome (634727436).

It can be divided in two parts, 1215 and 12315, that added together give a triangular number (13530 = T₁₆₄).

The spelling of 121512315 in words is "one hundred twenty-one million, five hundred twelve thousand, three hundred fifteen".