221941700 has 36 divisors (see below), whose sum is σ = 484435140. Its totient is φ = 88256640.

The previous prime is 221941693. The next prime is 221941711. The reversal of 221941700 is 7149122.

It can be written as a sum of positive squares in 6 ways, for example, as 13601344 + 208340356 = 3688^2 + 14434^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 221941700.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10886 + ... + 23714.

Almost surely, 2^221941700 is an apocalyptic number.

221941700 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 221941700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (242217570).

221941700 is an abundant number, since it is smaller than the sum of its proper divisors (262493440).

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

221941700 is a wasteful number, since it uses less digits than its factorization.

221941700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13016 (or 13009 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 221941700 is about 14897.7078773884. The cubic root of 221941700 is about 605.4518856031.

The spelling of 221941700 in words is "two hundred twenty-one million, nine hundred forty-one thousand, seven hundred".