1003551321220 has 384 divisors, whose sum is σ = 2692163174400. Its totient is φ = 306164441088.

The previous prime is 1003551321187. The next prime is 1003551321239. The reversal of 1003551321220 is 221231553001.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 2795407401 + ... + 2795407759.

It is an arithmetic number, because the mean of its divisors is an integer number (7010841600).

Almost surely, 2^{1003551321220} is an apocalyptic number.

1003551321220 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 1003551321220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1346081587200).

1003551321220 is an abundant number, since it is smaller than the sum of its proper divisors (1688611853180).

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

1003551321220 is a wasteful number, since it uses less digits than its factorization.

1003551321220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 867 (or 865 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 25.

Adding to 1003551321220 its reverse (221231553001), we get a palindrome (1224782874221).

The spelling of 1003551321220 in words is "one trillion, three billion, five hundred fifty-one million, three hundred twenty-one thousand, two hundred twenty".