621503120213 has 2 divisors, whose sum is σ = 621503120214. Its totient is φ = 621503120212.

The previous prime is 621503120209. The next prime is 621503120237. The reversal of 621503120213 is 312021305126.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 564507287569 + 56995832644 = 751337^2 + 238738^2 .

It is a cyclic number.

It is not a de Polignac number, because 621503120213 - 2² = 621503120209 is a prime.

It is a super-2 number, since 2×621503120213² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (621503120243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310751560106 + 310751560107.

It is an arithmetic number, because the mean of its divisors is an integer number (310751560107).

Almost surely, 2^621503120213 is an apocalyptic number.

It is an amenable number.

621503120213 is a deficient number, since it is larger than the sum of its proper divisors (1).

621503120213 is an equidigital number, since it uses as much as digits as its factorization.

621503120213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 26.

Adding to 621503120213 its reverse (312021305126), we get a palindrome (933524425339).

The spelling of 621503120213 in words is "six hundred twenty-one billion, five hundred three million, one hundred twenty thousand, two hundred thirteen".