6221332421 has 2 divisors, whose sum is σ = 6221332422. Its totient is φ = 6221332420.

The previous prime is 6221332357. The next prime is 6221332457. The reversal of 6221332421 is 1242331226.

6221332421 is digitally balanced in base 3, 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., 6138722500 + 82609921 = 78350^2 + 9089^2 .

It is a cyclic number.

It is not a de Polignac number, because 6221332421 - 2⁶ = 6221332357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6221338421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3110666210 + 3110666211.

It is an arithmetic number, because the mean of its divisors is an integer number (3110666211).

Almost surely, 2^6221332421 is an apocalyptic number.

It is an amenable number.

6221332421 is a deficient number, since it is larger than the sum of its proper divisors (1).

6221332421 is an equidigital number, since it uses as much as digits as its factorization.

6221332421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3456, while the sum is 26.

The square root of 6221332421 is about 78875.4234283405. The cubic root of 6221332421 is about 1839.1951052850.

Adding to 6221332421 its reverse (1242331226), we get a palindrome (7463663647).

The spelling of 6221332421 in words is "six billion, two hundred twenty-one million, three hundred thirty-two thousand, four hundred twenty-one".