1003121031000 has 256 divisors, whose sum is σ = 3423810124800. Its totient is φ = 242500608000.

The previous prime is 1003121030971. The next prime is 1003121031043. The reversal of 1003121031000 is 1301213001.

It is a super-2 number, since 2×1003121031000² (a number of 25 digits) contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 11804664 + ... + 11889336.

It is an arithmetic number, because the mean of its divisors is an integer number (13374258300).

Almost surely, 2^{1003121031000} is an apocalyptic number.

1003121031000 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 1003121031000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1711905062400).

1003121031000 is an abundant number, since it is smaller than the sum of its proper divisors (2420689093800).

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

1003121031000 is a wasteful number, since it uses less digits than its factorization.

1003121031000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85067 (or 85053 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 12.

Adding to 1003121031000 its reverse (1301213001), we get a palindrome (1004422244001).

The spelling of 1003121031000 in words is "one trillion, three billion, one hundred twenty-one million, thirty-one thousand".