20001011011001 has 4 divisors (see below), whose sum is σ = 20299533563472. Its totient is φ = 19702488458532.

The previous prime is 20001011010989. The next prime is 20001011011043. The reversal of 20001011011001 is 10011011010002.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20001011011001 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20001011011001.

It is not an unprimeable number, because it can be changed into a prime (20001011014001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 149261276135 + ... + 149261276268.

It is an arithmetic number, because the mean of its divisors is an integer number (5074883390868).

Almost surely, 2^{20001011011001} is an apocalyptic number.

It is an amenable number.

20001011011001 is a deficient number, since it is larger than the sum of its proper divisors (298522552471).

20001011011001 is an equidigital number, since it uses as much as digits as its factorization.

20001011011001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298522552470.

The product of its (nonzero) digits is 2, while the sum is 8.

Adding to 20001011011001 its reverse (10011011010002), we get a palindrome (30012022021003).

Subtracting from 20001011011001 its reverse (10011011010002), we obtain a palindrome (9990000000999).

The spelling of 20001011011001 in words is "twenty trillion, one billion, eleven million, eleven thousand, one".