2139165121 has 2 divisors, whose sum is σ = 2139165122. Its totient is φ = 2139165120.

The previous prime is 2139165113. The next prime is 2139165151. The reversal of 2139165121 is 1215619312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1549209600 + 589955521 = 39360^2 + 24289^2 .

It is a cyclic number.

It is not a de Polignac number, because 2139165121 - 2³ = 2139165113 is a prime.

It is not a weakly prime, because it can be changed into another prime (2139165151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1069582560 + 1069582561.

It is an arithmetic number, because the mean of its divisors is an integer number (1069582561).

Almost surely, 2^2139165121 is an apocalyptic number.

It is an amenable number.

2139165121 is a deficient number, since it is larger than the sum of its proper divisors (1).

2139165121 is an equidigital number, since it uses as much as digits as its factorization.

2139165121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3240, while the sum is 31.

The square root of 2139165121 is about 46251.1094029105. The cubic root of 2139165121 is about 1288.4911391055.

The spelling of 2139165121 in words is "two billion, one hundred thirty-nine million, one hundred sixty-five thousand, one hundred twenty-one".