121329999 has 12 divisors (see below), whose sum is σ = 200290896. Its totient is φ = 69331392.

The previous prime is 121329977. The next prime is 121330031. The reversal of 121329999 is 999923121.

It is not a de Polignac number, because 121329999 - 2⁸ = 121329743 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121329499) 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, 962874 + ... + 962999.

It is an arithmetic number, because the mean of its divisors is an integer number (16690908).

Almost surely, 2^121329999 is an apocalyptic number.

121329999 is a deficient number, since it is larger than the sum of its proper divisors (78960897).

121329999 is a wasteful number, since it uses less digits than its factorization.

121329999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1925886 (or 1925883 counting only the distinct ones).

The product of its digits is 78732, while the sum is 45.

The square root of 121329999 is about 11014.9897412571. The cubic root of 121329999 is about 495.0579791285.

The spelling of 121329999 in words is "one hundred twenty-one million, three hundred twenty-nine thousand, nine hundred ninety-nine".