18221534 has 8 divisors (see below), whose sum is σ = 27366768. Its totient is φ = 9099280.

The previous prime is 18221527. The next prime is 18221549. The reversal of 18221534 is 43512281.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3602 + ... + 7029.

It is an arithmetic number, because the mean of its divisors is an integer number (3420846).

Almost surely, 2^18221534 is an apocalyptic number.

18221534 is a deficient number, since it is larger than the sum of its proper divisors (9145234).

18221534 is a wasteful number, since it uses less digits than its factorization.

18221534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11490.

The product of its digits is 1920, while the sum is 26.

The square root of 18221534 is about 4268.6688791706. The cubic root of 18221534 is about 263.1449128375.

The spelling of 18221534 in words is "eighteen million, two hundred twenty-one thousand, five hundred thirty-four".