20212221100 has 36 divisors (see below), whose sum is σ = 44415733600. Its totient is φ = 7982544960.

The previous prime is 20212221067. The next prime is 20212221103. The reversal of 20212221100 is 112221202.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20212221103) 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, 1271355 + ... + 1287154.

Almost surely, 2^20212221100 is an apocalyptic number.

20212221100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20212221100 is an abundant number, since it is smaller than the sum of its proper divisors (24203512500).

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

20212221100 is a wasteful number, since it uses less digits than its factorization.

20212221100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2558602 (or 2558595 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 20212221100 its reverse (112221202), we get a palindrome (20324442302).

The spelling of 20212221100 in words is "twenty billion, two hundred twelve million, two hundred twenty-one thousand, one hundred".