212111001220 has 12 divisors (see below), whose sum is σ = 445433102604. Its totient is φ = 84844400480.

The previous prime is 212111001211. The next prime is 212111001247. The reversal of 212111001220 is 22100111212.

It can be written as a sum of positive squares in 2 ways, for example, as 61953201216 + 150157800004 = 248904^2 + 387502^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 212111001220.

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, 5302775011 + ... + 5302775050.

It is an arithmetic number, because the mean of its divisors is an integer number (37119425217).

Almost surely, 2^212111001220 is an apocalyptic number.

212111001220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212111001220 is an abundant number, since it is smaller than the sum of its proper divisors (233322101384).

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

212111001220 is a wasteful number, since it uses less digits than its factorization.

212111001220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10605550070 (or 10605550068 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 212111001220 its reverse (22100111212), we get a palindrome (234211112432).

The spelling of 212111001220 in words is "two hundred twelve billion, one hundred eleven million, one thousand, two hundred twenty".