121939215 has 48 divisors (see below), whose sum is σ = 216442368. Its totient is φ = 58499584.

The previous prime is 121939199. The next prime is 121939217. The reversal of 121939215 is 512939121.

It is not a de Polignac number, because 121939215 - 2⁴ = 121939199 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121939217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 99094 + ... + 100316.

It is an arithmetic number, because the mean of its divisors is an integer number (4509216).

Almost surely, 2^121939215 is an apocalyptic number.

121939215 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

121939215 is a deficient number, since it is larger than the sum of its proper divisors (94503153).

121939215 is a wasteful number, since it uses less digits than its factorization.

121939215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1288 (or 1271 counting only the distinct ones).

The product of its digits is 4860, while the sum is 33.

The square root of 121939215 is about 11042.6090667016. The cubic root of 121939215 is about 495.8851827865.

The spelling of 121939215 in words is "one hundred twenty-one million, nine hundred thirty-nine thousand, two hundred fifteen".