13654985221 has 2 divisors, whose sum is σ = 13654985222. Its totient is φ = 13654985220.

The previous prime is 13654985209. The next prime is 13654985231. The reversal of 13654985221 is 12258945631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7150562721 + 6504422500 = 84561^2 + 80650^2 .

It is an emirp because it is prime and its reverse (12258945631) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13654985221 - 2¹³ = 13654977029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13654985231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6827492610 + 6827492611.

It is an arithmetic number, because the mean of its divisors is an integer number (6827492611).

Almost surely, 2^13654985221 is an apocalyptic number.

It is an amenable number.

13654985221 is a deficient number, since it is larger than the sum of its proper divisors (1).

13654985221 is an equidigital number, since it uses as much as digits as its factorization.

13654985221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 518400, while the sum is 46.

The spelling of 13654985221 in words is "thirteen billion, six hundred fifty-four million, nine hundred eighty-five thousand, two hundred twenty-one".