121516015 has 16 divisors (see below), whose sum is σ = 155037888. Its totient is φ = 91227136.

The previous prime is 121515997. The next prime is 121516027. The reversal of 121516015 is 510615121.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 121516015 - 2¹¹ = 121513967 is a prime.

It is a super-2 number, since 2×121516015² = 29532283802960450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3874 + ... + 16063.

It is an arithmetic number, because the mean of its divisors is an integer number (9689868).

Almost surely, 2^121516015 is an apocalyptic number.

121516015 is a deficient number, since it is larger than the sum of its proper divisors (33521873).

121516015 is a wasteful number, since it uses less digits than its factorization.

121516015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20018.

The product of its (nonzero) digits is 300, while the sum is 22.

The square root of 121516015 is about 11023.4302737397. The cubic root of 121516015 is about 495.3108478452.

The spelling of 121516015 in words is "one hundred twenty-one million, five hundred sixteen thousand, fifteen".