2100121253 has 2 divisors, whose sum is σ = 2100121254. Its totient is φ = 2100121252.

The previous prime is 2100121189. The next prime is 2100121271. The reversal of 2100121253 is 3521210012.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1675019329 + 425101924 = 40927^2 + 20618^2 .

It is a cyclic number.

It is not a de Polignac number, because 2100121253 - 2⁶ = 2100121189 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2100121553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050060626 + 1050060627.

It is an arithmetic number, because the mean of its divisors is an integer number (1050060627).

Almost surely, 2^2100121253 is an apocalyptic number.

It is an amenable number.

2100121253 is a deficient number, since it is larger than the sum of its proper divisors (1).

2100121253 is an equidigital number, since it uses as much as digits as its factorization.

2100121253 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 2100121253 is about 45827.0799091542. The cubic root of 2100121253 is about 1280.6038111902.

Adding to 2100121253 its reverse (3521210012), we get a palindrome (5621331265).

The spelling of 2100121253 in words is "two billion, one hundred million, one hundred twenty-one thousand, two hundred fifty-three".