621531022361 has 4 divisors (see below), whose sum is σ = 627938558772. Its totient is φ = 615123485952.

The previous prime is 621531022309. The next prime is 621531022363. The reversal of 621531022361 is 163220135126.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 359034648025 + 262496374336 = 599195^2 + 512344^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-621531022361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (621531022363) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3203768060 + ... + 3203768253.

It is an arithmetic number, because the mean of its divisors is an integer number (156984639693).

Almost surely, 2^621531022361 is an apocalyptic number.

It is an amenable number.

621531022361 is a deficient number, since it is larger than the sum of its proper divisors (6407536411).

621531022361 is an equidigital number, since it uses as much as digits as its factorization.

621531022361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6407536410.

The product of its (nonzero) digits is 12960, while the sum is 32.

Adding to 621531022361 its reverse (163220135126), we get a palindrome (784751157487).

The spelling of 621531022361 in words is "six hundred twenty-one billion, five hundred thirty-one million, twenty-two thousand, three hundred sixty-one".