21814688181 has 16 divisors (see below), whose sum is σ = 34171260480. Its totient is φ = 12204021120.

The previous prime is 21814688173. The next prime is 21814688191. The reversal of 21814688181 is 18188641812.

It is not a de Polignac number, because 21814688181 - 2³ = 21814688173 is a prime.

It is a super-2 number, since 2×21814688181² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21814688181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21814688131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25424616 + ... + 25425473.

It is an arithmetic number, because the mean of its divisors is an integer number (2135703780).

Almost surely, 2^21814688181 is an apocalyptic number.

It is an amenable number.

21814688181 is a deficient number, since it is larger than the sum of its proper divisors (12356572299).

21814688181 is a wasteful number, since it uses less digits than its factorization.

21814688181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50850116.

The product of its digits is 196608, while the sum is 48.

The spelling of 21814688181 in words is "twenty-one billion, eight hundred fourteen million, six hundred eighty-eight thousand, one hundred eighty-one".