2001012021001 has 16 divisors (see below), whose sum is σ = 2424442024960. Its totient is φ = 1614965480640.

The previous prime is 2001012020999. The next prime is 2001012021103. The reversal of 2001012021001 is 1001202101002.

It is a cyclic number.

It is not a de Polignac number, because 2001012021001 - 2¹ = 2001012020999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2001012051001) 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, 124603506 + ... + 124619563.

It is an arithmetic number, because the mean of its divisors is an integer number (151527626560).

Almost surely, 2^{2001012021001} is an apocalyptic number.

It is an amenable number.

2001012021001 is a deficient number, since it is larger than the sum of its proper divisors (423430003959).

2001012021001 is a wasteful number, since it uses less digits than its factorization.

2001012021001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249223144.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 2001012021001 its reverse (1001202101002), we get a palindrome (3002214122003).

The spelling of 2001012021001 in words is "two trillion, one billion, twelve million, twenty-one thousand, one".