212113112220 has 36 divisors (see below), whose sum is σ = 643409774280. Its totient is φ = 56563496544.

The previous prime is 212113112219. The next prime is 212113112243. The reversal of 212113112220 is 22211311212.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 212113112193 and 212113112202.

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, 589202910 + ... + 589203269.

It is an arithmetic number, because the mean of its divisors is an integer number (17872493730).

Almost surely, 2^212113112220 is an apocalyptic number.

212113112220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212113112220 is an abundant number, since it is smaller than the sum of its proper divisors (431296662060).

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

212113112220 is a wasteful number, since it uses less digits than its factorization.

212113112220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1178406194 (or 1178406189 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 212113112220 its reverse (22211311212), we get a palindrome (234324423432).

The spelling of 212113112220 in words is "two hundred twelve billion, one hundred thirteen million, one hundred twelve thousand, two hundred twenty".