212100011220 has 24 divisors (see below), whose sum is σ = 593880031584. Its totient is φ = 56560002976.

The previous prime is 212100011213. The next prime is 212100011261. The reversal of 212100011220 is 22110001212.

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

It is a junction number, because it is equal to n+sod(n) for n = 212100011196 and 212100011205.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1767500034 + ... + 1767500153.

It is an arithmetic number, because the mean of its divisors is an integer number (24745001316).

Almost surely, 2^212100011220 is an apocalyptic number.

212100011220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212100011220 is an abundant number, since it is smaller than the sum of its proper divisors (381780020364).

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

212100011220 is a wasteful number, since it uses less digits than its factorization.

212100011220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3535000199 (or 3535000197 counting only the distinct ones).

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

Adding to 212100011220 its reverse (22110001212), we get a palindrome (234210012432).

The spelling of 212100011220 in words is "two hundred twelve billion, one hundred million, eleven thousand, two hundred twenty".