20001101000021 has 4 divisors (see below), whose sum is σ = 20017348849344. Its totient is φ = 19984853150700.

The previous prime is 20001100999991. The next prime is 20001101000029. The reversal of 20001101000021 is 12000010110002.

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 not a de Polignac number, because 20001101000021 - 2¹⁴ = 20001100983637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20001100999972 and 20001101000008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20001101000029) 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, 8123922815 + ... + 8123925276.

It is an arithmetic number, because the mean of its divisors is an integer number (5004337212336).

Almost surely, 2^{20001101000021} is an apocalyptic number.

It is an amenable number.

20001101000021 is a deficient number, since it is larger than the sum of its proper divisors (16247849323).

20001101000021 is a wasteful number, since it uses less digits than its factorization.

20001101000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16247849322.

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 20001101000021 its reverse (12000010110002), we get a palindrome (32001111110023).

The spelling of 20001101000021 in words is "twenty trillion, one billion, one hundred one million, twenty-one", and thus it is an aban number.