13837247621 has 2 divisors, whose sum is σ = 13837247622. Its totient is φ = 13837247620.

The previous prime is 13837247617. The next prime is 13837247681. The reversal of 13837247621 is 12674273831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9601060225 + 4236187396 = 97985^2 + 65086^2 .

It is a cyclic number.

It is not a de Polignac number, because 13837247621 - 2² = 13837247617 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13837247681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6918623810 + 6918623811.

It is an arithmetic number, because the mean of its divisors is an integer number (6918623811).

Almost surely, 2^13837247621 is an apocalyptic number.

It is an amenable number.

13837247621 is a deficient number, since it is larger than the sum of its proper divisors (1).

13837247621 is an equidigital number, since it uses as much as digits as its factorization.

13837247621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 338688, while the sum is 44.

The spelling of 13837247621 in words is "thirteen billion, eight hundred thirty-seven million, two hundred forty-seven thousand, six hundred twenty-one".