6224979721 has 2 divisors, whose sum is σ = 6224979722. Its totient is φ = 6224979720.

The previous prime is 6224979713. The next prime is 6224979731. The reversal of 6224979721 is 1279794226.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5175219721 + 1049760000 = 71939^2 + 32400^2 .

It is a cyclic number.

It is not a de Polignac number, because 6224979721 - 2³ = 6224979713 is a prime.

It is a super-2 number, since 2×6224979721² = 77500745053722475682, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (6224979701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3112489860 + 3112489861.

It is an arithmetic number, because the mean of its divisors is an integer number (3112489861).

Almost surely, 2^6224979721 is an apocalyptic number.

It is an amenable number.

6224979721 is a deficient number, since it is larger than the sum of its proper divisors (1).

6224979721 is an equidigital number, since it uses as much as digits as its factorization.

6224979721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 762048, while the sum is 49.

The square root of 6224979721 is about 78898.5406772521. The cubic root of 6224979721 is about 1839.5544487713.

The spelling of 6224979721 in words is "six billion, two hundred twenty-four million, nine hundred seventy-nine thousand, seven hundred twenty-one".