121312015 has 16 divisors (see below), whose sum is σ = 159096960. Its totient is φ = 88066720.

The previous prime is 121312013. The next prime is 121312039. The reversal of 121312015 is 510213121.

It is not a de Polignac number, because 121312015 - 2¹ = 121312013 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121312015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121312013) 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, 34572 + ... + 37918.

It is an arithmetic number, because the mean of its divisors is an integer number (9943560).

Almost surely, 2^121312015 is an apocalyptic number.

121312015 is a deficient number, since it is larger than the sum of its proper divisors (37784945).

121312015 is a wasteful number, since it uses less digits than its factorization.

121312015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4022.

The product of its (nonzero) digits is 60, while the sum is 16.

The square root of 121312015 is about 11014.1733688916. The cubic root of 121312015 is about 495.0335181194.

Adding to 121312015 its reverse (510213121), we get a palindrome (631525136).

The spelling of 121312015 in words is "one hundred twenty-one million, three hundred twelve thousand, fifteen".