1213222112020 has 72 divisors (see below), whose sum is σ = 2618722915200. Its totient is φ = 472129025280.

The previous prime is 1213222111961. The next prime is 1213222112029. The reversal of 1213222112020 is 202112223121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213222112029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12019321 + ... + 12119839.

It is an arithmetic number, because the mean of its divisors is an integer number (36371151600).

Almost surely, 2^{1213222112020} is an apocalyptic number.

1213222112020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1213222112020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1309361457600).

1213222112020 is an abundant number, since it is smaller than the sum of its proper divisors (1405500803180).

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

1213222112020 is a wasteful number, since it uses less digits than its factorization.

1213222112020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100969 (or 100926 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 1213222112020 its reverse (202112223121), we get a palindrome (1415334335141).

The spelling of 1213222112020 in words is "one trillion, two hundred thirteen billion, two hundred twenty-two million, one hundred twelve thousand, twenty".