212222120100020 has 48 divisors (see below), whose sum is σ = 461036105706960. Its totient is φ = 81961318419456.

The previous prime is 212222120099917. The next prime is 212222120100031. The reversal of 212222120100020 is 20001021222212.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 5470677746704 + 206751442353316 = 2338948^2 + 14378854^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 184872944 + ... + 186017336.

It is an arithmetic number, because the mean of its divisors is an integer number (9604918868895).

Almost surely, 2^{212222120100020} is an apocalyptic number.

212222120100020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212222120100020 is an abundant number, since it is smaller than the sum of its proper divisors (248813985606940).

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

212222120100020 is a wasteful number, since it uses less digits than its factorization.

212222120100020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1464164 (or 1464162 counting only the distinct ones).

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

Adding to 212222120100020 its reverse (20001021222212), we get a palindrome (232223141322232).

The spelling of 212222120100020 in words is "two hundred twelve trillion, two hundred twenty-two billion, one hundred twenty million, one hundred thousand, twenty".