221988000 has 192 divisors, whose sum is σ = 783724032. Its totient is φ = 54604800.

The previous prime is 221987971. The next prime is 221988007. The reversal of 221988000 is 889122.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (221988007) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 155289 + ... + 156711.

It is an arithmetic number, because the mean of its divisors is an integer number (4081896).

Almost surely, 2^221988000 is an apocalyptic number.

221988000 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 221988000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (391862016).

221988000 is an abundant number, since it is smaller than the sum of its proper divisors (561736032).

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

221988000 is a wasteful number, since it uses less digits than its factorization.

221988000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1464 (or 1446 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 30.

The square root of 221988000 is about 14899.2617266763. The cubic root of 221988000 is about 605.4939844564.

The spelling of 221988000 in words is "two hundred twenty-one million, nine hundred eighty-eight thousand".