18221143411838 has 8 divisors (see below), whose sum is σ = 27344540893800. Its totient is φ = 9106296447240.

The previous prime is 18221143411831. The next prime is 18221143411841. The reversal of 18221143411838 is 83811434112281.

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

It is a junction number, because it is equal to n+sod(n) for n = 18221143411792 and 18221143411801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18221143411831) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2137624013 + ... + 2137632536.

It is an arithmetic number, because the mean of its divisors is an integer number (3418067611725).

Almost surely, 2^{18221143411838} is an apocalyptic number.

18221143411838 is a deficient number, since it is larger than the sum of its proper divisors (9123397481962).

18221143411838 is a wasteful number, since it uses less digits than its factorization.

18221143411838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4275258682.

The product of its digits is 294912, while the sum is 47.

The spelling of 18221143411838 in words is "eighteen trillion, two hundred twenty-one billion, one hundred forty-three million, four hundred eleven thousand, eight hundred thirty-eight".