2102758121 has 2 divisors, whose sum is σ = 2102758122. Its totient is φ = 2102758120.

The previous prime is 2102758111. The next prime is 2102758123. The reversal of 2102758121 is 1218572012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1142440000 + 960318121 = 33800^2 + 30989^2 .

It is a cyclic number.

It is not a de Polignac number, because 2102758121 - 2⁶ = 2102758057 is a prime.

Together with 2102758123, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2102758123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1051379060 + 1051379061.

It is an arithmetic number, because the mean of its divisors is an integer number (1051379061).

Almost surely, 2^2102758121 is an apocalyptic number.

It is an amenable number.

2102758121 is a deficient number, since it is larger than the sum of its proper divisors (1).

2102758121 is an equidigital number, since it uses as much as digits as its factorization.

2102758121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2240, while the sum is 29.

The square root of 2102758121 is about 45855.8406421690. The cubic root of 2102758121 is about 1281.1395534191.

The spelling of 2102758121 in words is "two billion, one hundred two million, seven hundred fifty-eight thousand, one hundred twenty-one".