20001022001001 has 6 divisors (see below), whose sum is σ = 28890365112570. Its totient is φ = 13334014667328.

The previous prime is 20001022000937. The next prime is 20001022001017. The reversal of 20001022001001 is 10010022010002.

It can be written as a sum of positive squares in only one way, i.e., 10140944715225 + 9860077285776 = 3184485^2 + 3140076^2 .

It is not a de Polignac number, because 20001022001001 - 2⁶ = 20001022000937 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 2222335777889 = 20001022001001 / (2 + 0 + 0 + 0 + 1 + 0 + 2 + 2 + 0 + 0 + 1 + 0 + 0 + 1).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20001022201001) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1111167888936 + ... + 1111167888953.

It is an arithmetic number, because the mean of its divisors is an integer number (4815060852095).

Almost surely, 2^{20001022001001} is an apocalyptic number.

It is an amenable number.

20001022001001 is a deficient number, since it is larger than the sum of its proper divisors (8889343111569).

20001022001001 is a wasteful number, since it uses less digits than its factorization.

20001022001001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2222335777895 (or 2222335777892 counting only the distinct ones).

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

Adding to 20001022001001 its reverse (10010022010002), we get a palindrome (30011044011003).

Subtracting from 20001022001001 its reverse (10010022010002), we obtain a palindrome (9990999990999).

The spelling of 20001022001001 in words is "twenty trillion, one billion, twenty-two million, one thousand, one".