10003121500 has 24 divisors (see below), whose sum is σ = 21846818448. Its totient is φ = 4001248400.

The previous prime is 10003121441. The next prime is 10003121503. The reversal of 10003121500 is 512130001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10003121503) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10002622 + ... + 10003621.

It is an arithmetic number, because the mean of its divisors is an integer number (910284102).

Almost surely, 2^10003121500 is an apocalyptic number.

10003121500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

10003121500 is an abundant number, since it is smaller than the sum of its proper divisors (11843696948).

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

10003121500 is a wasteful number, since it uses less digits than its factorization.

10003121500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20006262 (or 20006250 counting only the distinct ones).

The product of its (nonzero) digits is 30, while the sum is 13.

Adding to 10003121500 its reverse (512130001), we get a palindrome (10515251501).

The spelling of 10003121500 in words is "ten billion, three million, one hundred twenty-one thousand, five hundred".