22181542 has 8 divisors (see below), whose sum is σ = 33304032. Its totient is φ = 11080200.

The previous prime is 22181539. The next prime is 22181557. The reversal of 22181542 is 24518122.

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 pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2334 + ... + 7057.

It is an arithmetic number, because the mean of its divisors is an integer number (4163004).

Almost surely, 2^22181542 is an apocalyptic number.

22181542 is a deficient number, since it is larger than the sum of its proper divisors (11122490).

22181542 is a wasteful number, since it uses less digits than its factorization.

22181542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10574.

The product of its digits is 1280, while the sum is 25.

The square root of 22181542 is about 4709.7284422777. The cubic root of 22181542 is about 280.9725618359.

Adding to 22181542 its reverse (24518122), we get a palindrome (46699664).

The spelling of 22181542 in words is "twenty-two million, one hundred eighty-one thousand, five hundred forty-two".