20010200021001 has 6 divisors (see below), whose sum is σ = 28903622252570. Its totient is φ = 13340133347328.

The previous prime is 20010200020891. The next prime is 20010200021051. The reversal of 20010200021001 is 10012000201002.

It can be written as a sum of positive squares in only one way, i.e., 14937637525776 + 5072562495225 = 3864924^2 + 2252235^2 .

It is not a de Polignac number, because 20010200021001 - 2²⁶ = 20010132912137 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: 2223355557889 = 20010200021001 / (2 + 0 + 0 + 1 + 0 + 2 + 0 + 0 + 0 + 2 + 1 + 0 + 0 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20010200021051) 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, 1111677778936 + ... + 1111677778953.

Almost surely, 2^{20010200021001} is an apocalyptic number.

It is an amenable number.

20010200021001 is a deficient number, since it is larger than the sum of its proper divisors (8893422231569).

20010200021001 is a wasteful number, since it uses less digits than its factorization.

20010200021001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2223355557895 (or 2223355557892 counting only the distinct ones).

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

Adding to 20010200021001 its reverse (10012000201002), we get a palindrome (30022200222003).

The spelling of 20010200021001 in words is "twenty trillion, ten billion, two hundred million, twenty-one thousand, one".