212120011220 has 48 divisors (see below), whose sum is σ = 479769603600. Its totient is φ = 78312738816.

The previous prime is 212120011171. The next prime is 212120011247. The reversal of 212120011220 is 22110021212.

It can be written as a sum of positive squares in 8 ways, for example, as 1591371664 + 210528639556 = 39892^2 + 458834^2 .

It is a junction number, because it is equal to n+sod(n) for n = 212120011195 and 212120011204.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2678756 + ... + 2756804.

It is an arithmetic number, because the mean of its divisors is an integer number (9995200075).

Almost surely, 2^212120011220 is an apocalyptic number.

212120011220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212120011220 is an abundant number, since it is smaller than the sum of its proper divisors (267649592380).

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

212120011220 is a wasteful number, since it uses less digits than its factorization.

212120011220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88524 (or 88522 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 212120011220 its reverse (22110021212), we get a palindrome (234230032432).

The spelling of 212120011220 in words is "two hundred twelve billion, one hundred twenty million, eleven thousand, two hundred twenty".