21618054 has 12 divisors (see below), whose sum is σ = 46839156. Its totient is φ = 7206012.

The previous prime is 21618053. The next prime is 21618059. The reversal of 21618054 is 45081612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21618053) 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 5 ways as a sum of consecutive naturals, for example, 600484 + ... + 600519.

It is an arithmetic number, because the mean of its divisors is an integer number (3903263).

Almost surely, 2^21618054 is an apocalyptic number.

21618054 is an abundant number, since it is smaller than the sum of its proper divisors (25221102).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21618054 is a wasteful number, since it uses less digits than its factorization.

21618054 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1201011 (or 1201008 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 21618054 is about 4649.5219109065. The cubic root of 21618054 is about 278.5729003022.

Adding to 21618054 its reverse (45081612), we get a palindrome (66699666).

The spelling of 21618054 in words is "twenty-one million, six hundred eighteen thousand, fifty-four".