1220333021000 has 128 divisors (see below), whose sum is σ = 2957942988000. Its totient is φ = 470679552000.

The previous prime is 1220333020999. The next prime is 1220333021071. The reversal of 1220333021000 is 1203330221.

It can be written as a sum of positive squares in 16 ways, for example, as 23728937764 + 1196604083236 = 154042^2 + 1093894^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1220333021000.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22273640 + ... + 22328360.

Almost surely, 2^{1220333021000} is an apocalyptic number.

1220333021000 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 1220333021000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1478971494000).

1220333021000 is an abundant number, since it is smaller than the sum of its proper divisors (1737609967000).

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

1220333021000 is a wasteful number, since it uses less digits than its factorization.

1220333021000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55540 (or 55526 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 17.

Adding to 1220333021000 its reverse (1203330221), we get a palindrome (1221536351221).

The spelling of 1220333021000 in words is "one trillion, two hundred twenty billion, three hundred thirty-three million, twenty-one thousand".