121215015 has 32 divisors (see below), whose sum is σ = 228173760. Its totient is φ = 60844032.

The previous prime is 121215007. The next prime is 121215019. The reversal of 121215015 is 510512121.

It is not a de Polignac number, because 121215015 - 2³ = 121215007 is a prime.

It is a super-2 number, since 2×121215015² = 29386159722900450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121215019) 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, 24114 + ... + 28703.

It is an arithmetic number, because the mean of its divisors is an integer number (7130430).

Almost surely, 2^121215015 is an apocalyptic number.

121215015 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

121215015 is a deficient number, since it is larger than the sum of its proper divisors (106958745).

121215015 is a wasteful number, since it uses less digits than its factorization.

121215015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52848 (or 52842 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 18.

The square root of 121215015 is about 11009.7690711477. The cubic root of 121215015 is about 494.9015414825.

Adding to 121215015 its reverse (510512121), we get a palindrome (631727136).

The spelling of 121215015 in words is "one hundred twenty-one million, two hundred fifteen thousand, fifteen".