20010211111001 has 4 divisors (see below), whose sum is σ = 20013398979492. Its totient is φ = 20007023242512.

The previous prime is 20010211110971. The next prime is 20010211111021. The reversal of 20010211111001 is 10011111201002.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12087449843401 + 7922761267600 = 3476701^2 + 2814740^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20010211111001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20010211111021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1593924830 + ... + 1593937383.

It is an arithmetic number, because the mean of its divisors is an integer number (5003349744873).

Almost surely, 2^{20010211111001} is an apocalyptic number.

It is an amenable number.

20010211111001 is a deficient number, since it is larger than the sum of its proper divisors (3187868491).

20010211111001 is an equidigital number, since it uses as much as digits as its factorization.

20010211111001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3187868490.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 20010211111001 its reverse (10011111201002), we get a palindrome (30021322312003).

Subtracting from 20010211111001 its reverse (10011111201002), we obtain a palindrome (9999099909999).

It can be divided in two parts, 200 and 10211111001, that added together give a palindrome (10211111201).

The spelling of 20010211111001 in words is "twenty trillion, ten billion, two hundred eleven million, one hundred eleven thousand, one".