20001021021101 has 4 divisors (see below), whose sum is σ = 20002376210400. Its totient is φ = 19999665831804.

The previous prime is 20001021021077. The next prime is 20001021021103. The reversal of 20001021021101 is 10112012010002.

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-20001021021101 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20001021021103) 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, 677572511 + ... + 677602028.

It is an arithmetic number, because the mean of its divisors is an integer number (5000594052600).

Almost surely, 2^{20001021021101} is an apocalyptic number.

It is an amenable number.

20001021021101 is a deficient number, since it is larger than the sum of its proper divisors (1355189299).

20001021021101 is a wasteful number, since it uses less digits than its factorization.

20001021021101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1355189298.

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

Adding to 20001021021101 its reverse (10112012010002), we get a palindrome (30113033031103).

It can be divided in two parts, 2000102 and 1021101, that added together give a palindrome (3021203).

The spelling of 20001021021101 in words is "twenty trillion, one billion, twenty-one million, twenty-one thousand, one hundred one".