121215150513 has 16 divisors (see below), whose sum is σ = 184431461760. Its totient is φ = 78626042928.

The previous prime is 121215150503. The next prime is 121215150521. The reversal of 121215150513 is 315051512121.

It is a happy number.

121215150513 is a `hidden beast` number, since 1 + 2 + 1 + 2 + 151 + 505 + 1 + 3 = 666.

It is not a de Polignac number, because 121215150513 - 2⁵ = 121215150481 is a prime.

It is a super-2 number, since 2×121215150513² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (121215150503) 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, 60667245 + ... + 60669242.

It is an arithmetic number, because the mean of its divisors is an integer number (11526966360).

Almost surely, 2^121215150513 is an apocalyptic number.

It is an amenable number.

121215150513 is a deficient number, since it is larger than the sum of its proper divisors (63216311247).

121215150513 is a wasteful number, since it uses less digits than its factorization.

121215150513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121336533 (or 121336527 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 27.

Adding to 121215150513 its reverse (315051512121), we get a palindrome (436266662634).

The spelling of 121215150513 in words is "one hundred twenty-one billion, two hundred fifteen million, one hundred fifty thousand, five hundred thirteen".