201121139 has 4 divisors (see below), whose sum is σ = 201586056. Its totient is φ = 200656224.

The previous prime is 201121133. The next prime is 201121153. The reversal of 201121139 is 931121102.

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

It is a cyclic number.

It is not a de Polignac number, because 201121139 - 2²⁰ = 200072563 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 201121139.

It is not an unprimeable number, because it can be changed into a prime (201121133) 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, 231809 + ... + 232674.

It is an arithmetic number, because the mean of its divisors is an integer number (50396514).

Almost surely, 2^201121139 is an apocalyptic number.

201121139 is a deficient number, since it is larger than the sum of its proper divisors (464917).

201121139 is an equidigital number, since it uses as much as digits as its factorization.

201121139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 464916.

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

The square root of 201121139 is about 14181.7184783791. The cubic root of 201121139 is about 585.8942555567.

The spelling of 201121139 in words is "two hundred one million, one hundred twenty-one thousand, one hundred thirty-nine".