212221112020 has 24 divisors (see below), whose sum is σ = 461032072200. Its totient is φ = 81961256832.

The previous prime is 212221112017. The next prime is 212221112039. The reversal of 212221112020 is 20211122212.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 22667109136 + 189554002884 = 150556^2 + 435378^2 .

It is a junction number, because it is equal to n+sod(n) for n = 212221111985 and 212221112003.

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, 182948655 + ... + 182949814.

It is an arithmetic number, because the mean of its divisors is an integer number (19209669675).

Almost surely, 2^212221112020 is an apocalyptic number.

212221112020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212221112020 is an abundant number, since it is smaller than the sum of its proper divisors (248810960180).

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

212221112020 is a wasteful number, since it uses less digits than its factorization.

212221112020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 365898507 (or 365898505 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 212221112020 its reverse (20211122212), we get a palindrome (232432234232).

The spelling of 212221112020 in words is "two hundred twelve billion, two hundred twenty-one million, one hundred twelve thousand, twenty".