2521216493 has 2 divisors, whose sum is σ = 2521216494. Its totient is φ = 2521216492.

The previous prime is 2521216483. The next prime is 2521216541. The reversal of 2521216493 is 3946121252.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2335112329 + 186104164 = 48323^2 + 13642^2 .

It is a cyclic number.

It is not a de Polignac number, because 2521216493 - 2⁶ = 2521216429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2521216483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1260608246 + 1260608247.

It is an arithmetic number, because the mean of its divisors is an integer number (1260608247).

Almost surely, 2^2521216493 is an apocalyptic number.

It is an amenable number.

2521216493 is a deficient number, since it is larger than the sum of its proper divisors (1).

2521216493 is an equidigital number, since it uses as much as digits as its factorization.

2521216493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 35.

The square root of 2521216493 is about 50211.7166904299. The cubic root of 2521216493 is about 1361.0373596695.

The spelling of 2521216493 in words is "two billion, five hundred twenty-one million, two hundred sixteen thousand, four hundred ninety-three".