21181838182 has 16 divisors (see below), whose sum is σ = 31926686400. Its totient is φ = 10539668160.

The previous prime is 21181838173. The next prime is 21181838203. The reversal of 21181838182 is 28183818112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 755332 + ... + 782872.

It is an arithmetic number, because the mean of its divisors is an integer number (1995417900).

Almost surely, 2^21181838182 is an apocalyptic number.

21181838182 is a deficient number, since it is larger than the sum of its proper divisors (10744848218).

21181838182 is a wasteful number, since it uses less digits than its factorization.

21181838182 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29391.

The product of its digits is 49152, while the sum is 43.

It can be divided in two parts, 211818 and 38182, that added together give a square (250000 = 500²).

The spelling of 21181838182 in words is "twenty-one billion, one hundred eighty-one million, eight hundred thirty-eight thousand, one hundred eighty-two".