2001012021003 has 16 divisors (see below), whose sum is σ = 2671341742080. Its totient is φ = 1332345431424.

The previous prime is 2001012020999. The next prime is 2001012021103. The reversal of 2001012021003 is 3001202101002.

It is not a de Polignac number, because 2001012021003 - 2² = 2001012020999 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2001012021003.

It is not an unprimeable number, because it can be changed into a prime (2001012021103) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37563075 + ... + 37616307.

It is an arithmetic number, because the mean of its divisors is an integer number (166958858880).

Almost surely, 2^{2001012021003} is an apocalyptic number.

2001012021003 is a deficient number, since it is larger than the sum of its proper divisors (670329721077).

2001012021003 is a wasteful number, since it uses less digits than its factorization.

2001012021003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68618.

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

Adding to 2001012021003 its reverse (3001202101002), we get a palindrome (5002214122005).

The spelling of 2001012021003 in words is "two trillion, one billion, twelve million, twenty-one thousand, three".