212221100100 has 72 divisors (see below), whose sum is σ = 625611833280. Its totient is φ = 55524510080.

The previous prime is 212221100071. The next prime is 212221100173. The reversal of 212221100100 is 1001122212.

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

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6657720 + ... + 6689519.

It is an arithmetic number, because the mean of its divisors is an integer number (8689053240).

Almost surely, 2^212221100100 is an apocalyptic number.

212221100100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212221100100 is an abundant number, since it is smaller than the sum of its proper divisors (413390733180).

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

212221100100 is a wasteful number, since it uses less digits than its factorization.

212221100100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13347309 (or 13347302 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 212221100100 its reverse (1001122212), we get a palindrome (213222222312).

The spelling of 212221100100 in words is "two hundred twelve billion, two hundred twenty-one million, one hundred thousand, one hundred".