1002111111220 has 48 divisors (see below), whose sum is σ = 2157435680400. Its totient is φ = 390763950080.

The previous prime is 1002111111203. The next prime is 1002111111233. The reversal of 1002111111220 is 221111112001.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 294204268836 + 707906842384 = 542406^2 + 841372^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1002111111220.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 582936 + ... + 1531024.

It is an arithmetic number, because the mean of its divisors is an integer number (44946576675).

Almost surely, 2^{1002111111220} is an apocalyptic number.

1002111111220 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 1002111111220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1078717840200).

1002111111220 is an abundant number, since it is smaller than the sum of its proper divisors (1155324569180).

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

1002111111220 is a wasteful number, since it uses less digits than its factorization.

1002111111220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 949428 (or 949426 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 1002111111220 its reverse (221111112001), we get a palindrome (1223222223221).

The spelling of 1002111111220 in words is "one trillion, two billion, one hundred eleven million, one hundred eleven thousand, two hundred twenty".