20001200021101 has 4 divisors (see below), whose sum is σ = 21539753868892. Its totient is φ = 18462646173312.

The previous prime is 20001200021063. The next prime is 20001200021113. The reversal of 20001200021101 is 10112000210002.

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 2449541140201 + 17551658880900 = 1565101^2 + 4189470^2 .

It is a cyclic number.

It is not a de Polignac number, because 20001200021101 - 2¹⁹ = 20001199496813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20001200021141) 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, 769276923876 + ... + 769276923901.

It is an arithmetic number, because the mean of its divisors is an integer number (5384938467223).

Almost surely, 2^{20001200021101} is an apocalyptic number.

It is an amenable number.

20001200021101 is a deficient number, since it is larger than the sum of its proper divisors (1538553847791).

20001200021101 is a wasteful number, since it uses less digits than its factorization.

20001200021101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1538553847790.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 20001200021101 its reverse (10112000210002), we get a palindrome (30113200231103).

The spelling of 20001200021101 in words is "twenty trillion, one billion, two hundred million, twenty-one thousand, one hundred one".