121215912 has 32 divisors (see below), whose sum is σ = 305433600. Its totient is φ = 40086144.

The previous prime is 121215907. The next prime is 121215917. The reversal of 121215912 is 219512121.

It is an interprime number because it is at equal distance from previous prime (121215907) and next prime (121215917).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (121215917) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16837 + ... + 22932.

It is an arithmetic number, because the mean of its divisors is an integer number (9544800).

Almost surely, 2^121215912 is an apocalyptic number.

121215912 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

121215912 is an abundant number, since it is smaller than the sum of its proper divisors (184217688).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121215912 is a wasteful number, since it uses less digits than its factorization.

121215912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39905 (or 39901 counting only the distinct ones).

The product of its digits is 360, while the sum is 24.

The square root of 121215912 is about 11009.8098076216. The cubic root of 121215912 is about 494.9027622487.

The spelling of 121215912 in words is "one hundred twenty-one million, two hundred fifteen thousand, nine hundred twelve".