121201139 has 4 divisors (see below), whose sum is σ = 121244256. Its totient is φ = 121158024.

The previous prime is 121201127. The next prime is 121201153. The reversal of 121201139 is 931102121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121201139 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121201139.

It is not an unprimeable number, because it can be changed into a prime (121200139) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17024 + ... + 23069.

It is an arithmetic number, because the mean of its divisors is an integer number (30311064).

Almost surely, 2^121201139 is an apocalyptic number.

121201139 is a deficient number, since it is larger than the sum of its proper divisors (43117).

121201139 is an equidigital number, since it uses as much as digits as its factorization.

121201139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43116.

The product of its (nonzero) digits is 108, while the sum is 20.

The square root of 121201139 is about 11009.1388854896. The cubic root of 121201139 is about 494.8826562648.

The spelling of 121201139 in words is "one hundred twenty-one million, two hundred one thousand, one hundred thirty-nine".