14891485309721 has 2 divisors, whose sum is σ = 14891485309722. Its totient is φ = 14891485309720.

The previous prime is 14891485309583. The next prime is 14891485309783. The reversal of 14891485309721 is 12790358419841.

It is an a-pointer prime, because the next prime (14891485309783) can be obtained adding 14891485309721 to its sum of digits (62).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14626914985225 + 264570324496 = 3824515^2 + 514364^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-14891485309721 is a prime.

It is not a weakly prime, because it can be changed into another prime (14891485305721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7445742654860 + 7445742654861.

It is an arithmetic number, because the mean of its divisors is an integer number (7445742654861).

Almost surely, 2^{14891485309721} is an apocalyptic number.

It is an amenable number.

14891485309721 is a deficient number, since it is larger than the sum of its proper divisors (1).

14891485309721 is an equidigital number, since it uses as much as digits as its factorization.

14891485309721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17418240, while the sum is 62.

The spelling of 14891485309721 in words is "fourteen trillion, eight hundred ninety-one billion, four hundred eighty-five million, three hundred nine thousand, seven hundred twenty-one".