13895117821 has 8 divisors (see below), whose sum is σ = 15039935064. Its totient is φ = 12761152320.

The previous prime is 13895117801. The next prime is 13895117843. The reversal of 13895117821 is 12871159831.

It can be written as a sum of positive squares in 4 ways, for example, as 2459168100 + 11435949721 = 49590^2 + 106939^2 .

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 13895117821 - 2²⁵ = 13861563389 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 (13895117801) 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, 2710270 + ... + 2715391.

It is an arithmetic number, because the mean of its divisors is an integer number (1879991883).

Almost surely, 2^13895117821 is an apocalyptic number.

It is an amenable number.

13895117821 is a deficient number, since it is larger than the sum of its proper divisors (1144817243).

13895117821 is a wasteful number, since it uses less digits than its factorization.

13895117821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5425871.

The product of its digits is 120960, while the sum is 46.

The spelling of 13895117821 in words is "thirteen billion, eight hundred ninety-five million, one hundred seventeen thousand, eight hundred twenty-one".