2101504121 has 2 divisors, whose sum is σ = 2101504122. Its totient is φ = 2101504120.

The previous prime is 2101504109. The next prime is 2101504151. The reversal of 2101504121 is 1214051012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2005248400 + 96255721 = 44780^2 + 9811^2 .

It is a cyclic number.

It is not a de Polignac number, because 2101504121 - 2²⁶ = 2034395257 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2101504121.

It is not a weakly prime, because it can be changed into another prime (2101504151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050752060 + 1050752061.

It is an arithmetic number, because the mean of its divisors is an integer number (1050752061).

Almost surely, 2^2101504121 is an apocalyptic number.

It is an amenable number.

2101504121 is a deficient number, since it is larger than the sum of its proper divisors (1).

2101504121 is an equidigital number, since it uses as much as digits as its factorization.

2101504121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 80, while the sum is 17.

The square root of 2101504121 is about 45842.1653175327. The cubic root of 2101504121 is about 1280.8848294845.

Adding to 2101504121 its reverse (1214051012), we get a palindrome (3315555133).

The spelling of 2101504121 in words is "two billion, one hundred one million, five hundred four thousand, one hundred twenty-one".