1201222220212 has 72 divisors (see below), whose sum is σ = 2518830562248. Its totient is φ = 499477708800.

The previous prime is 1201222220153. The next prime is 1201222220221. The reversal of 1201222220212 is 2120222221021.

It can be written as a sum of positive squares in 4 ways, for example, as 343016376976 + 858205843236 = 585676^2 + 926394^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1201222220212.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1041588 + ... + 1867444.

It is an arithmetic number, because the mean of its divisors is an integer number (34983757809).

Almost surely, 2^{1201222220212} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1201222220212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1259415281124).

1201222220212 is an abundant number, since it is smaller than the sum of its proper divisors (1317608342036).

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

1201222220212 is a wasteful number, since it uses less digits than its factorization.

1201222220212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 826097 (or 826088 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 1201222220212 its reverse (2120222221021), we get a palindrome (3321444441233).

The spelling of 1201222220212 in words is "one trillion, two hundred one billion, two hundred twenty-two million, two hundred twenty thousand, two hundred twelve".