121299909 has 8 divisors (see below), whose sum is σ = 162410880. Its totient is φ = 80527776.

The previous prime is 121299883. The next prime is 121299943. The reversal of 121299909 is 909992121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 121299909 - 2¹⁵ = 121267141 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121299979) 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, 83872 + ... + 85305.

It is an arithmetic number, because the mean of its divisors is an integer number (20301360).

Almost surely, 2^121299909 is an apocalyptic number.

It is an amenable number.

121299909 is a deficient number, since it is larger than the sum of its proper divisors (41110971).

121299909 is a wasteful number, since it uses less digits than its factorization.

121299909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169419.

The product of its (nonzero) digits is 26244, while the sum is 42.

The square root of 121299909 is about 11013.6237905605. The cubic root of 121299909 is about 495.0170507340.

It can be divided in two parts, 12 and 1299909, that added together give a palindrome (1299921).

The spelling of 121299909 in words is "one hundred twenty-one million, two hundred ninety-nine thousand, nine hundred nine".