121239200809 has 8 divisors (see below), whose sum is σ = 125211562560. Its totient is φ = 117303451056.

The previous prime is 121239200807. The next prime is 121239200821. The reversal of 121239200809 is 908002932121.

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

It is a cyclic number.

It is not a de Polignac number, because 121239200809 - 2¹ = 121239200807 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121239200807) 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, 9146269 + ... + 9159514.

It is an arithmetic number, because the mean of its divisors is an integer number (15651445320).

Almost surely, 2^121239200809 is an apocalyptic number.

It is an amenable number.

121239200809 is a deficient number, since it is larger than the sum of its proper divisors (3972361751).

121239200809 is a wasteful number, since it uses less digits than its factorization.

121239200809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18305999.

The product of its (nonzero) digits is 15552, while the sum is 37.

The spelling of 121239200809 in words is "one hundred twenty-one billion, two hundred thirty-nine million, two hundred thousand, eight hundred nine".