121650015 has 16 divisors (see below), whose sum is σ = 195090048. Its totient is φ = 64730016.

The previous prime is 121649987. The next prime is 121650019. The reversal of 121650015 is 510056121.

It is not a de Polignac number, because 121650015 - 2⁷ = 121649887 is a prime.

It is a super-2 number, since 2×121650015² = 29597452299000450, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 121649973 and 121650000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121650019) 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, 2509 + ... + 15798.

It is an arithmetic number, because the mean of its divisors is an integer number (12193128).

Almost surely, 2^121650015 is an apocalyptic number.

121650015 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

121650015 is a deficient number, since it is larger than the sum of its proper divisors (73440033).

121650015 is a wasteful number, since it uses less digits than its factorization.

121650015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18758.

The product of its (nonzero) digits is 300, while the sum is 21.

The square root of 121650015 is about 11029.5065619456. The cubic root of 121650015 is about 495.4928465492.

The spelling of 121650015 in words is "one hundred twenty-one million, six hundred fifty thousand, fifteen".