13866706421 has 8 divisors (see below), whose sum is σ = 14683826520. Its totient is φ = 13049745408.

The previous prime is 13866706393. The next prime is 13866706433. The reversal of 13866706421 is 12460766831.

It can be written as a sum of positive squares in 4 ways, for example, as 218625796 + 13648080625 = 14786^2 + 116825^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13866706421 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 (13866706471) 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, 171935 + ... + 239363.

It is an arithmetic number, because the mean of its divisors is an integer number (1835478315).

Almost surely, 2^13866706421 is an apocalyptic number.

It is an amenable number.

13866706421 is a deficient number, since it is larger than the sum of its proper divisors (817120099).

13866706421 is a wasteful number, since it uses less digits than its factorization.

13866706421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79543.

The product of its (nonzero) digits is 290304, while the sum is 44.

The spelling of 13866706421 in words is "thirteen billion, eight hundred sixty-six million, seven hundred six thousand, four hundred twenty-one".