1220222221000 has 32 divisors (see below), whose sum is σ = 2855319999480. Its totient is φ = 488088888000.

The previous prime is 1220222220991. The next prime is 1220222221007. The reversal of 1220222221000 is 1222220221.

It can be written as a sum of positive squares in 4 ways, for example, as 162323575236 + 1057898645764 = 402894^2 + 1028542^2 .

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 7 ways as a sum of consecutive naturals, for example, 610110111 + ... + 610112110.

Almost surely, 2^{1220222221000} is an apocalyptic number.

1220222221000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220222221000 is an abundant number, since it is smaller than the sum of its proper divisors (1635097778480).

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

1220222221000 is a wasteful number, since it uses less digits than its factorization.

1220222221000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1220222242 (or 1220222228 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 1220222221000 its reverse (1222220221), we get a palindrome (1221444441221).

The spelling of 1220222221000 in words is "one trillion, two hundred twenty billion, two hundred twenty-two million, two hundred twenty-one thousand".