21983800 has 24 divisors (see below), whose sum is σ = 51112800. Its totient is φ = 8793440.

The previous prime is 21983747. The next prime is 21983807. The reversal of 21983800 is 838912.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21983807) 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, 54760 + ... + 55159.

It is an arithmetic number, because the mean of its divisors is an integer number (2129700).

Almost surely, 2^21983800 is an apocalyptic number.

21983800 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21983800 is an abundant number, since it is smaller than the sum of its proper divisors (29129000).

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

21983800 is a wasteful number, since it uses less digits than its factorization.

21983800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109935 (or 109926 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 21983800 is about 4688.6885159925. The cubic root of 21983800 is about 280.1351388479.

The spelling of 21983800 in words is "twenty-one million, nine hundred eighty-three thousand, eight hundred".