212111100220 has 12 divisors (see below), whose sum is σ = 445433310504. Its totient is φ = 84844440080.

The previous prime is 212111100151. The next prime is 212111100247. The reversal of 212111100220 is 22001111212.

It is a super-2 number, since 2×212111100220² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 212111100220.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5302777486 + ... + 5302777525.

It is an arithmetic number, because the mean of its divisors is an integer number (37119442542).

Almost surely, 2^212111100220 is an apocalyptic number.

212111100220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212111100220 is an abundant number, since it is smaller than the sum of its proper divisors (233322210284).

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

212111100220 is a wasteful number, since it uses less digits than its factorization.

212111100220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10605555020 (or 10605555018 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 212111100220 its reverse (22001111212), we get a palindrome (234112211432).

The spelling of 212111100220 in words is "two hundred twelve billion, one hundred eleven million, one hundred thousand, two hundred twenty".