20001012002001 has 24 divisors (see below), whose sum is σ = 28901025392096. Its totient is φ = 13329081956160.

The previous prime is 20001012001967. The next prime is 20001012002003. The reversal of 20001012002001 is 10020021010002.

It is not a de Polignac number, because 20001012002001 - 2¹⁵ = 20001011969233 is a prime.

It is a super-2 number, since 2×20001012002001² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20001012002003) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 439337826 + ... + 439383348.

Almost surely, 2^{20001012002001} is an apocalyptic number.

It is an amenable number.

20001012002001 is a deficient number, since it is larger than the sum of its proper divisors (8900013390095).

20001012002001 is a wasteful number, since it uses less digits than its factorization.

20001012002001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62493 (or 62490 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 20001012002001 its reverse (10020021010002), we get a palindrome (30021033012003).

The spelling of 20001012002001 in words is "twenty trillion, one billion, twelve million, two thousand, one".