2100121511 has 2 divisors, whose sum is σ = 2100121512. Its totient is φ = 2100121510.

The previous prime is 2100121493. The next prime is 2100121523. The reversal of 2100121511 is 1151210012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2100121511 - 2⁶ = 2100121447 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2100121711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050060755 + 1050060756.

It is an arithmetic number, because the mean of its divisors is an integer number (1050060756).

Almost surely, 2^2100121511 is an apocalyptic number.

2100121511 is a deficient number, since it is larger than the sum of its proper divisors (1).

2100121511 is an equidigital number, since it uses as much as digits as its factorization.

2100121511 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20, while the sum is 14.

The square root of 2100121511 is about 45827.0827240836. The cubic root of 2100121511 is about 1280.6038636310.

Adding to 2100121511 its reverse (1151210012), we get a palindrome (3251331523).

The spelling of 2100121511 in words is "two billion, one hundred million, one hundred twenty-one thousand, five hundred eleven".