13563652420421 has 8 divisors (see below), whose sum is σ = 13823615249400. Its totient is φ = 13306153694400.

The previous prime is 13563652420399. The next prime is 13563652420447. The reversal of 13563652420421 is 12402425636531.

It can be written as a sum of positive squares in 4 ways, for example, as 8532468839521 + 5031183580900 = 2921039^2 + 2243030^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13563652420421 - 2²⁶ = 13563585311557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13563652420471) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 616014626 + ... + 616036643.

It is an arithmetic number, because the mean of its divisors is an integer number (1727951906175).

Almost surely, 2^{13563652420421} is an apocalyptic number.

It is an amenable number.

13563652420421 is a deficient number, since it is larger than the sum of its proper divisors (259962828979).

13563652420421 is a wasteful number, since it uses less digits than its factorization.

13563652420421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1232051479.

The product of its (nonzero) digits is 1036800, while the sum is 44.

The spelling of 13563652420421 in words is "thirteen trillion, five hundred sixty-three billion, six hundred fifty-two million, four hundred twenty thousand, four hundred twenty-one".