21818054 has 8 divisors (see below), whose sum is σ = 32825208. Its totient is φ = 10876320.

The previous prime is 21818051. The next prime is 21818059. The reversal of 21818054 is 45081812.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21818051) by changing a digit.

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, 15512 + ... + 16859.

It is an arithmetic number, because the mean of its divisors is an integer number (4103151).

Almost surely, 2^21818054 is an apocalyptic number.

21818054 is a deficient number, since it is larger than the sum of its proper divisors (11007154).

21818054 is a wasteful number, since it uses less digits than its factorization.

21818054 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32710.

The product of its (nonzero) digits is 2560, while the sum is 29.

The square root of 21818054 is about 4670.9799828302. The cubic root of 21818054 is about 279.4293394427.

Adding to 21818054 its reverse (45081812), we get a palindrome (66899866).

The spelling of 21818054 in words is "twenty-one million, eight hundred eighteen thousand, fifty-four".