121309929 has 24 divisors (see below), whose sum is σ = 195216840. Its totient is φ = 72076032.

The previous prime is 121309919. The next prime is 121309949. The reversal of 121309929 is 929903121.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 23299929 + 98010000 = 4827^2 + 9900^2 .

It is not a de Polignac number, because 121309929 - 2⁸ = 121309673 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121309893 and 121309902.

It is not an unprimeable number, because it can be changed into a prime (121309919) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14484 + ... + 21269.

It is an arithmetic number, because the mean of its divisors is an integer number (8134035).

Almost surely, 2^121309929 is an apocalyptic number.

It is an amenable number.

121309929 is a deficient number, since it is larger than the sum of its proper divisors (73906911).

121309929 is a wasteful number, since it uses less digits than its factorization.

121309929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35801 (or 35798 counting only the distinct ones).

The product of its (nonzero) digits is 8748, while the sum is 36.

The square root of 121309929 is about 11014.0786723175. The cubic root of 121309929 is about 495.0306806817.

The spelling of 121309929 in words is "one hundred twenty-one million, three hundred nine thousand, nine hundred twenty-nine".