20021021021101 has 4 divisors (see below), whose sum is σ = 21074758969600. Its totient is φ = 18967283072604.

The previous prime is 20021021021093. The next prime is 20021021021179. The reversal of 20021021021101 is 10112012012002.

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 20021021021101 - 2³ = 20021021021093 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 (20021021001101) 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, 526868974221 + ... + 526868974258.

It is an arithmetic number, because the mean of its divisors is an integer number (5268689742400).

Almost surely, 2^{20021021021101} is an apocalyptic number.

It is an amenable number.

20021021021101 is a deficient number, since it is larger than the sum of its proper divisors (1053737948499).

20021021021101 is a wasteful number, since it uses less digits than its factorization.

20021021021101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1053737948498.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 20021021021101 its reverse (10112012012002), we get a palindrome (30133033033103).

Subtracting from 20021021021101 its reverse (10112012012002), we obtain a palindrome (9909009009099).

It can be divided in two parts, 2002102 and 1021101, that added together give a palindrome (3023203).

The spelling of 20021021021101 in words is "twenty trillion, twenty-one billion, twenty-one million, twenty-one thousand, one hundred one".