20001111121001 has 8 divisors (see below), whose sum is σ = 20489032910304. Its totient is φ = 19513193608480.

The previous prime is 20001111120961. The next prime is 20001111121051. The reversal of 20001111121001 is 10012111110002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20001111121001 - 2²⁶ = 20001044012137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20001111121051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9707006 + ... + 11585688.

It is an arithmetic number, because the mean of its divisors is an integer number (2561129113788).

Almost surely, 2^{20001111121001} is an apocalyptic number.

It is an amenable number.

20001111121001 is a deficient number, since it is larger than the sum of its proper divisors (487921789303).

20001111121001 is a wasteful number, since it uses less digits than its factorization.

20001111121001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2138391.

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

Adding to 20001111121001 its reverse (10012111110002), we get a palindrome (30013222231003).

The spelling of 20001111121001 in words is "twenty trillion, one billion, one hundred eleven million, one hundred twenty-one thousand, one".