2521216109 has 2 divisors, whose sum is σ = 2521216110. Its totient is φ = 2521216108.

The previous prime is 2521216079. The next prime is 2521216141. The reversal of 2521216109 is 9016121252.

2521216109 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1455193609 + 1066022500 = 38147^2 + 32650^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2521216109 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2521216169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1260608054 + 1260608055.

It is an arithmetic number, because the mean of its divisors is an integer number (1260608055).

Almost surely, 2^2521216109 is an apocalyptic number.

It is an amenable number.

2521216109 is a deficient number, since it is larger than the sum of its proper divisors (1).

2521216109 is an equidigital number, since it uses as much as digits as its factorization.

2521216109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 2521216109 is about 50211.7128666211. The cubic root of 2521216109 is about 1361.0372905708.

The spelling of 2521216109 in words is "two billion, five hundred twenty-one million, two hundred sixteen thousand, one hundred nine".