9413216621 has 2 divisors, whose sum is σ = 9413216622. Its totient is φ = 9413216620.

The previous prime is 9413216597. The next prime is 9413216623. The reversal of 9413216621 is 1266123149.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8242824100 + 1170392521 = 90790^2 + 34211^2 .

It is an emirp because it is prime and its reverse (1266123149) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9413216621 - 2¹⁰ = 9413215597 is a prime.

Together with 9413216623, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9413216623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4706608310 + 4706608311.

It is an arithmetic number, because the mean of its divisors is an integer number (4706608311).

Almost surely, 2^9413216621 is an apocalyptic number.

It is an amenable number.

9413216621 is a deficient number, since it is larger than the sum of its proper divisors (1).

9413216621 is an equidigital number, since it uses as much as digits as its factorization.

9413216621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 35.

The square root of 9413216621 is about 97021.7327251993. The cubic root of 9413216621 is about 2111.4429473971.

The spelling of 9413216621 in words is "nine billion, four hundred thirteen million, two hundred sixteen thousand, six hundred twenty-one".