2102121157 has 2 divisors, whose sum is σ = 2102121158. Its totient is φ = 2102121156.

The previous prime is 2102121137. The next prime is 2102121169. The reversal of 2102121157 is 7511212012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1253797281 + 848323876 = 35409^2 + 29126^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2102121157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2102121137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1051060578 + 1051060579.

It is an arithmetic number, because the mean of its divisors is an integer number (1051060579).

Almost surely, 2^2102121157 is an apocalyptic number.

It is an amenable number.

2102121157 is a deficient number, since it is larger than the sum of its proper divisors (1).

2102121157 is an equidigital number, since it uses as much as digits as its factorization.

2102121157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 280, while the sum is 22.

The square root of 2102121157 is about 45848.8948285561. The cubic root of 2102121157 is about 1281.0101801326.

Adding to 2102121157 its reverse (7511212012), we get a palindrome (9613333169).

The spelling of 2102121157 in words is "two billion, one hundred two million, one hundred twenty-one thousand, one hundred fifty-seven".