21483918 has 48 divisors (see below), whose sum is σ = 48864816. Its totient is φ = 6814080.

The previous prime is 21483911. The next prime is 21483919. The reversal of 21483918 is 81938412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21483911) 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 23 ways as a sum of consecutive naturals, for example, 31396 + ... + 32072.

It is an arithmetic number, because the mean of its divisors is an integer number (1018017).

Almost surely, 2^21483918 is an apocalyptic number.

21483918 is an abundant number, since it is smaller than the sum of its proper divisors (27380898).

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

21483918 is a wasteful number, since it uses less digits than its factorization.

21483918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 769 (or 766 counting only the distinct ones).

The product of its digits is 13824, while the sum is 36.

The square root of 21483918 is about 4635.0747566787. The cubic root of 21483918 is about 277.9955401869.

The spelling of 21483918 in words is "twenty-one million, four hundred eighty-three thousand, nine hundred eighteen".