212221212020 has 12 divisors (see below), whose sum is σ = 445664545284. Its totient is φ = 84888484800.

The previous prime is 212221212017. The next prime is 212221212061. The reversal of 212221212020 is 20212122212.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 30057850384 + 182163361636 = 173372^2 + 426806^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 212221212020.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5305530281 + ... + 5305530320.

It is an arithmetic number, because the mean of its divisors is an integer number (37138712107).

Almost surely, 2^212221212020 is an apocalyptic number.

212221212020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212221212020 is an abundant number, since it is smaller than the sum of its proper divisors (233443333264).

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

212221212020 is a wasteful number, since it uses less digits than its factorization.

212221212020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10611060610 (or 10611060608 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 212221212020 its reverse (20212122212), we get a palindrome (232433334232).

The spelling of 212221212020 in words is "two hundred twelve billion, two hundred twenty-one million, two hundred twelve thousand, twenty".