121299678 has 24 divisors (see below), whose sum is σ = 263098368. Its totient is φ = 40389792.

The previous prime is 121299617. The next prime is 121299679. The reversal of 121299678 is 876992121.

It is a super-2 number, since 2×121299678² = 29427223765807368, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121299679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16675 + ... + 22817.

It is an arithmetic number, because the mean of its divisors is an integer number (10962432).

Almost surely, 2^121299678 is an apocalyptic number.

121299678 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

121299678 is an abundant number, since it is smaller than the sum of its proper divisors (141798690).

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

121299678 is a wasteful number, since it uses less digits than its factorization.

121299678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7248 (or 7245 counting only the distinct ones).

The product of its digits is 108864, while the sum is 45.

The square root of 121299678 is about 11013.6133035439. The cubic root of 121299678 is about 495.0167365018.

The spelling of 121299678 in words is "one hundred twenty-one million, two hundred ninety-nine thousand, six hundred seventy-eight".