21983400 has 240 divisors, whose sum is σ = 81021600. Its totient is φ = 5512320.

The previous prime is 21983387. The next prime is 21983407. The reversal of 21983400 is 438912.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (21983407) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 372571 + ... + 372629.

It is an arithmetic number, because the mean of its divisors is an integer number (337590).

Almost surely, 2^21983400 is an apocalyptic number.

21983400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21983400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40510800).

21983400 is an abundant number, since it is smaller than the sum of its proper divisors (59038200).

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

21983400 is a wasteful number, since it uses less digits than its factorization.

21983400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110 (or 92 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 21983400 is about 4688.6458599472. The cubic root of 21983400 is about 280.1334397978.

The spelling of 21983400 in words is "twenty-one million, nine hundred eighty-three thousand, four hundred".