2421221317 has 2 divisors, whose sum is σ = 2421221318. Its totient is φ = 2421221316.

The previous prime is 2421221279. The next prime is 2421221323. The reversal of 2421221317 is 7131221242.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2261097601 + 160123716 = 47551^2 + 12654^2 .

It is a cyclic number.

It is not a de Polignac number, because 2421221317 - 2¹⁹ = 2420697029 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2421221291 and 2421221300.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2421221377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1210610658 + 1210610659.

It is an arithmetic number, because the mean of its divisors is an integer number (1210610659).

Almost surely, 2^2421221317 is an apocalyptic number.

It is an amenable number.

2421221317 is a deficient number, since it is larger than the sum of its proper divisors (1).

2421221317 is an equidigital number, since it uses as much as digits as its factorization.

2421221317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1344, while the sum is 25.

The square root of 2421221317 is about 49205.9073384487. The cubic root of 2421221317 is about 1342.8005062076.

Adding to 2421221317 its reverse (7131221242), we get a palindrome (9552442559).

The spelling of 2421221317 in words is "two billion, four hundred twenty-one million, two hundred twenty-one thousand, three hundred seventeen".