20011021102001 has 8 divisors (see below), whose sum is σ = 21199711918464. Its totient is φ = 18823616055360.

The previous prime is 20011021101949. The next prime is 20011021102019. The reversal of 20011021102001 is 10020112011002.

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 20011021102001 - 2⁴² = 15612974590897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20011021104001) 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, 321410405 + ... + 321472658.

It is an arithmetic number, because the mean of its divisors is an integer number (2649963989808).

Almost surely, 2^{20011021102001} is an apocalyptic number.

It is an amenable number.

20011021102001 is a deficient number, since it is larger than the sum of its proper divisors (1188690816463).

20011021102001 is a wasteful number, since it uses less digits than its factorization.

20011021102001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 642884911.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 20011021102001 its reverse (10020112011002), we get a palindrome (30031133113003).

Subtracting from 20011021102001 its reverse (10020112011002), we obtain a palindrome (9990909090999).

The spelling of 20011021102001 in words is "twenty trillion, eleven billion, twenty-one million, one hundred two thousand, one".