1001123220 has 48 divisors (see below), whose sum is σ = 2825238528. Its totient is φ = 264862080.

The previous prime is 1001123219. The next prime is 1001123261. The reversal of 1001123220 is 223211001.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 1001123196 and 1001123205.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58071 + ... + 73310.

It is an arithmetic number, because the mean of its divisors is an integer number (58859136).

Almost surely, 2^1001123220 is an apocalyptic number.

1001123220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1001123220 is an abundant number, since it is smaller than the sum of its proper divisors (1824115308).

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

1001123220 is a wasteful number, since it uses less digits than its factorization.

1001123220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131520 (or 131518 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 1001123220 is about 31640.5312850464. The cubic root of 1001123220 is about 1000.3742665737.

Adding to 1001123220 its reverse (223211001), we get a palindrome (1224334221).

The spelling of 1001123220 in words is "one billion, one million, one hundred twenty-three thousand, two hundred twenty".