220221100 has 36 divisors (see below), whose sum is σ = 521326008. Its totient is φ = 80080000.

The previous prime is 220221097. The next prime is 220221101. The reversal of 220221100 is 1122022.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220221101) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 99001 + ... + 101200.

It is an arithmetic number, because the mean of its divisors is an integer number (14481278).

Almost surely, 2^220221100 is an apocalyptic number.

220221100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

220221100 is an abundant number, since it is smaller than the sum of its proper divisors (301104908).

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

220221100 is a wasteful number, since it uses less digits than its factorization.

220221100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200226 (or 200219 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 220221100 is about 14839.8483819748. The cubic root of 220221100 is about 603.8832391291.

Adding to 220221100 its reverse (1122022), we get a palindrome (221343122).

The spelling of 220221100 in words is "two hundred twenty million, two hundred twenty-one thousand, one hundred".