13974199721 has 2 divisors, whose sum is σ = 13974199722. Its totient is φ = 13974199720.

The previous prime is 13974199711. The next prime is 13974199741. The reversal of 13974199721 is 12799147931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8210353321 + 5763846400 = 90611^2 + 75920^2 .

It is a cyclic number.

It is not a de Polignac number, because 13974199721 - 2¹⁸ = 13973937577 is a prime.

It is not a weakly prime, because it can be changed into another prime (13974199711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6987099860 + 6987099861.

It is an arithmetic number, because the mean of its divisors is an integer number (6987099861).

Almost surely, 2^13974199721 is an apocalyptic number.

It is an amenable number.

13974199721 is a deficient number, since it is larger than the sum of its proper divisors (1).

13974199721 is an equidigital number, since it uses as much as digits as its factorization.

13974199721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 857304, while the sum is 53.

The spelling of 13974199721 in words is "thirteen billion, nine hundred seventy-four million, one hundred ninety-nine thousand, seven hundred twenty-one".