622400221 has 2 divisors, whose sum is σ = 622400222. Its totient is φ = 622400220.

The previous prime is 622400201. The next prime is 622400227. The reversal of 622400221 is 122004226.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 534303225 + 88096996 = 23115^2 + 9386^2 .

It is a cyclic number.

It is not a de Polignac number, because 622400221 - 2¹⁷ = 622269149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (622400227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 311200110 + 311200111.

It is an arithmetic number, because the mean of its divisors is an integer number (311200111).

Almost surely, 2^622400221 is an apocalyptic number.

It is an amenable number.

622400221 is a deficient number, since it is larger than the sum of its proper divisors (1).

622400221 is an equidigital number, since it uses as much as digits as its factorization.

622400221 is an evil number, because the sum of its binary digits is even.

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

The square root of 622400221 is about 24947.9502364423. The cubic root of 622400221 is about 853.8008432514.

Adding to 622400221 its reverse (122004226), we get a palindrome (744404447).

The spelling of 622400221 in words is "six hundred twenty-two million, four hundred thousand, two hundred twenty-one".