1001123221020 has 144 divisors (see below), whose sum is σ = 3126458680800. Its totient is φ = 237932577792.

The previous prime is 1001123220997. The next prime is 1001123221067. The reversal of 1001123221020 is 201223211001.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 107095 + ... + 1419054.

Almost surely, 2^{1001123221020} is an apocalyptic number.

1001123221020 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 1001123221020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1563229340400).

1001123221020 is an abundant number, since it is smaller than the sum of its proper divisors (2125335459780).

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

1001123221020 is a wasteful number, since it uses less digits than its factorization.

1001123221020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1526232 (or 1526201 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 1001123221020 its reverse (201223211001), we get a palindrome (1202346432021).

The spelling of 1001123221020 in words is "one trillion, one billion, one hundred twenty-three million, two hundred twenty-one thousand, twenty".