121906015 has 32 divisors (see below), whose sum is σ = 186292224. Its totient is φ = 74365440.

The previous prime is 121905991. The next prime is 121906019. The reversal of 121906015 is 510609121.

It is not a de Polignac number, because 121906015 - 2⁵ = 121905983 is a prime.

It is a super-2 number, since 2×121906015² = 29722152986360450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121906019) 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, 14727 + ... + 21463.

It is an arithmetic number, because the mean of its divisors is an integer number (5821632).

Almost surely, 2^121906015 is an apocalyptic number.

121906015 is a deficient number, since it is larger than the sum of its proper divisors (64386209).

121906015 is a wasteful number, since it uses less digits than its factorization.

121906015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6807.

The product of its (nonzero) digits is 540, while the sum is 25.

The square root of 121906015 is about 11041.1056964418. The cubic root of 121906015 is about 495.8401743440.

The spelling of 121906015 in words is "one hundred twenty-one million, nine hundred six thousand, fifteen".