13990948721 has 2 divisors, whose sum is σ = 13990948722. Its totient is φ = 13990948720.

The previous prime is 13990948717. The next prime is 13990948729. The reversal of 13990948721 is 12784909931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13990158400 + 790321 = 118280^2 + 889^2 .

It is an emirp because it is prime and its reverse (12784909931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13990948721 - 2² = 13990948717 is a prime.

It is a super-2 number, since 2×13990948721² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (13990948729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6995474360 + 6995474361.

It is an arithmetic number, because the mean of its divisors is an integer number (6995474361).

Almost surely, 2^13990948721 is an apocalyptic number.

It is an amenable number.

13990948721 is a deficient number, since it is larger than the sum of its proper divisors (1).

13990948721 is an equidigital number, since it uses as much as digits as its factorization.

13990948721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 979776, while the sum is 53.

The spelling of 13990948721 in words is "thirteen billion, nine hundred ninety million, nine hundred forty-eight thousand, seven hundred twenty-one".