621334747321 has 2 divisors, whose sum is σ = 621334747322. Its totient is φ = 621334747320.

The previous prime is 621334747237. The next prime is 621334747339. The reversal of 621334747321 is 123747433126.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 584253853225 + 37080894096 = 764365^2 + 192564^2 .

It is a cyclic number.

It is not a de Polignac number, because 621334747321 - 2⁷ = 621334747193 is a prime.

It is not a weakly prime, because it can be changed into another prime (621334787321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310667373660 + 310667373661.

It is an arithmetic number, because the mean of its divisors is an integer number (310667373661).

Almost surely, 2^621334747321 is an apocalyptic number.

It is an amenable number.

621334747321 is a deficient number, since it is larger than the sum of its proper divisors (1).

621334747321 is an equidigital number, since it uses as much as digits as its factorization.

621334747321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 508032, while the sum is 43.

The spelling of 621334747321 in words is "six hundred twenty-one billion, three hundred thirty-four million, seven hundred forty-seven thousand, three hundred twenty-one".