221900000 has 144 divisors (see below), whose sum is σ = 626022432. Its totient is φ = 75840000.

The previous prime is 221899987. The next prime is 221900039. The reversal of 221900000 is 9122.

It is a super-2 number, since 2×221900000² = 98479220000000000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 699842 + ... + 700158.

It is an arithmetic number, because the mean of its divisors is an integer number (4347378).

Almost surely, 2^221900000 is an apocalyptic number.

221900000 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 221900000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (313011216).

221900000 is an abundant number, since it is smaller than the sum of its proper divisors (404122432).

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

221900000 is an frugal number, since it uses more digits than its factorization.

221900000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 359 (or 331 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 221900000 is about 14896.3082674869. The cubic root of 221900000 is about 605.4139643457.

Adding to 221900000 its reverse (9122), we get a palindrome (221909122).

The spelling of 221900000 in words is "two hundred twenty-one million, nine hundred thousand".