1003121220 has 24 divisors (see below), whose sum is σ = 2808739584. Its totient is φ = 267498976.

The previous prime is 1003121213. The next prime is 1003121239. The reversal of 1003121220 is 221213001.

1003121220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 = 1003121196 and 1003121205.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8359284 + ... + 8359403.

It is an arithmetic number, because the mean of its divisors is an integer number (117030816).

Almost surely, 2^1003121220 is an apocalyptic number.

1003121220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1003121220 is an abundant number, since it is smaller than the sum of its proper divisors (1805618364).

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

1003121220 is a wasteful number, since it uses less digits than its factorization.

1003121220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16718699 (or 16718697 counting only the distinct ones).

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

The square root of 1003121220 is about 31672.0889743635. The cubic root of 1003121220 is about 1001.0393260937.

Adding to 1003121220 its reverse (221213001), we get a palindrome (1224334221).

The spelling of 1003121220 in words is "one billion, three million, one hundred twenty-one thousand, two hundred twenty".