2521216541 has 2 divisors, whose sum is σ = 2521216542. Its totient is φ = 2521216540.

The previous prime is 2521216493. The next prime is 2521216547. The reversal of 2521216541 is 1456121252.

2521216541 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2463136900 + 58079641 = 49630^2 + 7621^2 .

It is a cyclic number.

It is not a de Polignac number, because 2521216541 - 2²² = 2517022237 is a prime.

It is a super-2 number, since 2×2521216541² = 12713065693224009362, which contains 22 as substring.

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 (2521216547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1260608270 + 1260608271.

It is an arithmetic number, because the mean of its divisors is an integer number (1260608271).

Almost surely, 2^2521216541 is an apocalyptic number.

It is an amenable number.

2521216541 is a deficient number, since it is larger than the sum of its proper divisors (1).

2521216541 is an equidigital number, since it uses as much as digits as its factorization.

2521216541 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4800, while the sum is 29.

The square root of 2521216541 is about 50211.7171684060. The cubic root of 2521216541 is about 1361.0373683068.

Adding to 2521216541 its reverse (1456121252), we get a palindrome (3977337793).

The spelling of 2521216541 in words is "two billion, five hundred twenty-one million, two hundred sixteen thousand, five hundred forty-one".