1200000221220 has 192 divisors, whose sum is σ = 3550766607360. Its totient is φ = 301966963200.

The previous prime is 1200000221213. The next prime is 1200000221297. The reversal of 1200000221220 is 221220000021.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 1200000221196 and 1200000221205.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 389229799 + ... + 389232881.

It is an arithmetic number, because the mean of its divisors is an integer number (18493576080).

Almost surely, 2^{1200000221220} is an apocalyptic number.

1200000221220 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 1200000221220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1775383303680).

1200000221220 is an abundant number, since it is smaller than the sum of its proper divisors (2350766386140).

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

1200000221220 is a wasteful number, since it uses less digits than its factorization.

1200000221220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4346 (or 4344 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 1200000221220 its reverse (221220000021), we get a palindrome (1421220221241).

The spelling of 1200000221220 in words is "one trillion, two hundred billion, two hundred twenty-one thousand, two hundred twenty".