6222421 has 2 divisors, whose sum is σ = 6222422. Its totient is φ = 6222420.

The previous prime is 6222409. The next prime is 6222439. The reversal of 6222421 is 1242226.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4223025 + 1999396 = 2055^2 + 1414^2 .

It is a cyclic number.

It is not a de Polignac number, because 6222421 - 2⁹ = 6221909 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6222451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3111210 + 3111211.

It is an arithmetic number, because the mean of its divisors is an integer number (3111211).

Almost surely, 2^6222421 is an apocalyptic number.

It is an amenable number.

6222421 is a deficient number, since it is larger than the sum of its proper divisors (1).

6222421 is an equidigital number, since it uses as much as digits as its factorization.

6222421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 384, while the sum is 19.

The square root of 6222421 is about 2494.4781017279. The cubic root of 6222421 is about 183.9302370218.

Adding to 6222421 its reverse (1242226), we get a palindrome (7464647).

The spelling of 6222421 in words is "six million, two hundred twenty-two thousand, four hundred twenty-one".