212323111220 has 96 divisors (see below), whose sum is σ = 509598867456. Its totient is φ = 73602460800.

The previous prime is 212323111213. The next prime is 212323111303. The reversal of 212323111220 is 22111323212.

212323111220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×212323111220² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 212323111192 and 212323111201.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 224609 + ... + 689271.

It is an arithmetic number, because the mean of its divisors is an integer number (5308321536).

Almost surely, 2^212323111220 is an apocalyptic number.

212323111220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 212323111220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (254799433728).

212323111220 is an abundant number, since it is smaller than the sum of its proper divisors (297275756236).

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

212323111220 is a wasteful number, since it uses less digits than its factorization.

212323111220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 464781 (or 464779 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 212323111220 its reverse (22111323212), we get a palindrome (234434434432).

The spelling of 212323111220 in words is "two hundred twelve billion, three hundred twenty-three million, one hundred eleven thousand, two hundred twenty".