2121132157 has 2 divisors, whose sum is σ = 2121132158. Its totient is φ = 2121132156.

The previous prime is 2121132121. The next prime is 2121132161. The reversal of 2121132157 is 7512311212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1644626916 + 476505241 = 40554^2 + 21829^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2121132157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2121132757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060566078 + 1060566079.

It is an arithmetic number, because the mean of its divisors is an integer number (1060566079).

Almost surely, 2^2121132157 is an apocalyptic number.

It is an amenable number.

2121132157 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121132157 is an equidigital number, since it uses as much as digits as its factorization.

2121132157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 840, while the sum is 25.

The square root of 2121132157 is about 46055.7505312854. The cubic root of 2121132157 is about 1284.8602970047.

Adding to 2121132157 its reverse (7512311212), we get a palindrome (9633443369).

The spelling of 2121132157 in words is "two billion, one hundred twenty-one million, one hundred thirty-two thousand, one hundred fifty-seven".