1222012221220 has 192 divisors, whose sum is σ = 3081774366720. Its totient is φ = 397960814592.

The previous prime is 1222012221103. The next prime is 1222012221233. The reversal of 1222012221220 is 221222102221.

It is a super-2 number, since 2×1222012221220² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

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 63 ways as a sum of consecutive naturals, for example, 424455741 + ... + 424458619.

It is an arithmetic number, because the mean of its divisors is an integer number (16050908160).

Almost surely, 2^{1222012221220} is an apocalyptic number.

1222012221220 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 1222012221220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1540887183360).

1222012221220 is an abundant number, since it is smaller than the sum of its proper divisors (1859762145500).

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

1222012221220 is a wasteful number, since it uses less digits than its factorization.

1222012221220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3794 (or 3792 counting only the distinct ones).

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

Adding to 1222012221220 its reverse (221222102221), we get a palindrome (1443234323441).

The spelling of 1222012221220 in words is "one trillion, two hundred twenty-two billion, twelve million, two hundred twenty-one thousand, two hundred twenty".