2003123021021 has 4 divisors (see below), whose sum is σ = 2016388736544. Its totient is φ = 1989857305500.

The previous prime is 2003123021017. The next prime is 2003123021033. The reversal of 2003123021021 is 1201203213002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2003123021021 - 2² = 2003123021017 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2003123021321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6632857535 + ... + 6632857836.

It is an arithmetic number, because the mean of its divisors is an integer number (504097184136).

Almost surely, 2^{2003123021021} is an apocalyptic number.

It is an amenable number.

2003123021021 is a deficient number, since it is larger than the sum of its proper divisors (13265715523).

2003123021021 is a wasteful number, since it uses less digits than its factorization.

2003123021021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13265715522.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 2003123021021 its reverse (1201203213002), we get a palindrome (3204326234023).

The spelling of 2003123021021 in words is "two trillion, three billion, one hundred twenty-three million, twenty-one thousand, twenty-one".