221210220 has 96 divisors (see below), whose sum is σ = 772240896. Its totient is φ = 45964800.

The previous prime is 221210207. The next prime is 221210243. The reversal of 221210220 is 22012122.

It is a super-2 number, since 2×221210220² = 97867922864896800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 221210196 and 221210205.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19321 + ... + 28560.

It is an arithmetic number, because the mean of its divisors is an integer number (8044176).

Almost surely, 2^221210220 is an apocalyptic number.

221210220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221210220 is an abundant number, since it is smaller than the sum of its proper divisors (551030676).

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

221210220 is a wasteful number, since it uses less digits than its factorization.

221210220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47911 (or 47909 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 221210220 is about 14873.1375304607. The cubic root of 221210220 is about 604.7859999454.

Adding to 221210220 its reverse (22012122), we get a palindrome (243222342).

It can be divided in two parts, 2212102 and 20, that added together give a palindrome (2212122).

The spelling of 221210220 in words is "two hundred twenty-one million, two hundred ten thousand, two hundred twenty".