1220222221002 has 144 divisors (see below), whose sum is σ = 3036205292640. Its totient is φ = 352863806976.

The previous prime is 1220222220991. The next prime is 1220222221007. The reversal of 1220222221002 is 2001222220221.

1220222221002 is a `hidden beast` number, since 1 + 220 + 222 + 221 + 0 + 0 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (1220222221007) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 3490173 + ... + 3823839.

Almost surely, 2^{1220222221002} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1220222221002, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1518102646320).

1220222221002 is an abundant number, since it is smaller than the sum of its proper divisors (1815983071638).

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

1220222221002 is a wasteful number, since it uses less digits than its factorization.

1220222221002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333765 (or 333745 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 1220222221002 its reverse (2001222220221), we get a palindrome (3221444441223).

It can be divided in two parts, 1220 and 222221002, that added together give a palindrome (222222222).

The spelling of 1220222221002 in words is "one trillion, two hundred twenty billion, two hundred twenty-two million, two hundred twenty-one thousand, two".