621303737340421 has 2 divisors, whose sum is σ = 621303737340422. Its totient is φ = 621303737340420.

The previous prime is 621303737340401. The next prime is 621303737340449. The reversal of 621303737340421 is 124043737303126.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 597532895804196 + 23770841536225 = 24444486^2 + 4875535^2 .

It is a cyclic number.

It is not a de Polignac number, because 621303737340421 - 2¹¹ = 621303737338373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (621303737340401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310651868670210 + 310651868670211.

It is an arithmetic number, because the mean of its divisors is an integer number (310651868670211).

Almost surely, 2^{621303737340421} is an apocalyptic number.

It is an amenable number.

621303737340421 is a deficient number, since it is larger than the sum of its proper divisors (1).

621303737340421 is an equidigital number, since it uses as much as digits as its factorization.

621303737340421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1524096, while the sum is 46.

The spelling of 621303737340421 in words is "six hundred twenty-one trillion, three hundred three billion, seven hundred thirty-seven million, three hundred forty thousand, four hundred twenty-one".