121399929 has 24 divisors (see below), whose sum is σ = 200803200. Its totient is φ = 69234048.

The previous prime is 121399909. The next prime is 121399939. The reversal of 121399929 is 929993121.

It is not a de Polignac number, because 121399929 - 2⁵ = 121399897 is a prime.

It is a super-2 number, since 2×121399929² = 29475885522410082, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (121399909) 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, 36129 + ... + 39345.

It is an arithmetic number, because the mean of its divisors is an integer number (8366800).

Almost surely, 2^121399929 is an apocalyptic number.

It is an amenable number.

121399929 is a deficient number, since it is larger than the sum of its proper divisors (79403271).

121399929 is a wasteful number, since it uses less digits than its factorization.

121399929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3829 (or 3826 counting only the distinct ones).

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

The square root of 121399929 is about 11018.1635947194. The cubic root of 121399929 is about 495.1530717293.

The spelling of 121399929 in words is "one hundred twenty-one million, three hundred ninety-nine thousand, nine hundred twenty-nine".