2521420217 has 2 divisors, whose sum is σ = 2521420218. Its totient is φ = 2521420216.

The previous prime is 2521420207. The next prime is 2521420259. The reversal of 2521420217 is 7120241252.

2521420217 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., 1317399616 + 1204020601 = 36296^2 + 34699^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2521420217 is a prime.

It is not a weakly prime, because it can be changed into another prime (2521420207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1260710108 + 1260710109.

It is an arithmetic number, because the mean of its divisors is an integer number (1260710109).

Almost surely, 2^2521420217 is an apocalyptic number.

It is an amenable number.

2521420217 is a deficient number, since it is larger than the sum of its proper divisors (1).

2521420217 is an equidigital number, since it uses as much as digits as its factorization.

2521420217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2240, while the sum is 26.

The square root of 2521420217 is about 50213.7452994695. The cubic root of 2521420217 is about 1361.0740177018.

Adding to 2521420217 its reverse (7120241252), we get a palindrome (9641661469).

The spelling of 2521420217 in words is "two billion, five hundred twenty-one million, four hundred twenty thousand, two hundred seventeen".