212011221220 has 48 divisors (see below), whose sum is σ = 447159097728. Its totient is φ = 84436064000.

The previous prime is 212011221199. The next prime is 212011221271. The reversal of 212011221220 is 22122110212.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 212011221194 and 212011221203.

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, 18181632 + ... + 18193288.

It is an arithmetic number, because the mean of its divisors is an integer number (9315814536).

Almost surely, 2^212011221220 is an apocalyptic number.

212011221220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212011221220 is an abundant number, since it is smaller than the sum of its proper divisors (235147876508).

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

212011221220 is a wasteful number, since it uses less digits than its factorization.

212011221220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15540 (or 15538 counting only the distinct ones).

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

Adding to 212011221220 its reverse (22122110212), we get a palindrome (234133331432).

It can be divided in two parts, 21201 and 1221220, that added together give a palindrome (1242421).

The spelling of 212011221220 in words is "two hundred twelve billion, eleven million, two hundred twenty-one thousand, two hundred twenty".