212111222100 has 36 divisors (see below), whose sum is σ = 613708470144. Its totient is φ = 56562992480.

The previous prime is 212111222077. The next prime is 212111222111. The reversal of 212111222100 is 1222111212.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 212111222100.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 353518404 + ... + 353519003.

It is an arithmetic number, because the mean of its divisors is an integer number (17047457504).

Almost surely, 2^212111222100 is an apocalyptic number.

212111222100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212111222100 is an abundant number, since it is smaller than the sum of its proper divisors (401597248044).

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

212111222100 is a wasteful number, since it uses less digits than its factorization.

212111222100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 707037424 (or 707037417 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 212111222100 its reverse (1222111212), we get a palindrome (213333333312).

The spelling of 212111222100 in words is "two hundred twelve billion, one hundred eleven million, two hundred twenty-two thousand, one hundred".