221210020212100 has 54 divisors (see below), whose sum is σ = 491448747369930. Its totient is φ = 86426240382720.

The previous prime is 221210020212073. The next prime is 221210020212121. The reversal of 221210020212100 is 1212020012122.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 1742209925184 + 219467810286916 = 1319928^2 + 14814446^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 598003365 + ... + 598373164.

Almost surely, 2^{221210020212100} is an apocalyptic number.

221210020212100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221210020212100 is an abundant number, since it is smaller than the sum of its proper divisors (270238727157830).

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

221210020212100 is a wasteful number, since it uses less digits than its factorization.

221210020212100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1196376629 (or 1196376579 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 221210020212100 its reverse (1212020012122), we get a palindrome (222422040224222).

The spelling of 221210020212100 in words is "two hundred twenty-one trillion, two hundred ten billion, twenty million, two hundred twelve thousand, one hundred".