212211223420 has 96 divisors (see below), whose sum is σ = 514704153600. Its totient is φ = 71988355584.

The previous prime is 212211223417. The next prime is 212211223489. The reversal of 212211223420 is 24322112212.

212211223420 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 212211223391 and 212211223400.

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, 18148936 + ... + 18160624.

It is an arithmetic number, because the mean of its divisors is an integer number (5361501600).

Almost surely, 2^212211223420 is an apocalyptic number.

212211223420 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 212211223420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (257352076800).

212211223420 is an abundant number, since it is smaller than the sum of its proper divisors (302492930180).

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

212211223420 is a wasteful number, since it uses less digits than its factorization.

212211223420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13067 (or 13065 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 212211223420 its reverse (24322112212), we get a palindrome (236533335632).

The spelling of 212211223420 in words is "two hundred twelve billion, two hundred eleven million, two hundred twenty-three thousand, four hundred twenty".