20022100201021 has 4 divisors (see below), whose sum is σ = 20247067619100. Its totient is φ = 19797132782944.

The previous prime is 20022100200943. The next prime is 20022100201043. The reversal of 20022100201021 is 12010200122002.

It is a happy number.

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 3993047024121 + 16029053176900 = 1998261^2 + 4003630^2 .

It is a cyclic number.

It is not a de Polignac number, because 20022100201021 - 2²³ = 20022091812413 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20022100200992 and 20022100201010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20022100201091) 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, 112483708906 + ... + 112483709083.

It is an arithmetic number, because the mean of its divisors is an integer number (5061766904775).

Almost surely, 2^{20022100201021} is an apocalyptic number.

It is an amenable number.

20022100201021 is a deficient number, since it is larger than the sum of its proper divisors (224967418079).

20022100201021 is an equidigital number, since it uses as much as digits as its factorization.

20022100201021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224967418078.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 20022100201021 its reverse (12010200122002), we get a palindrome (32032300323023).

The spelling of 20022100201021 in words is "twenty trillion, twenty-two billion, one hundred million, two hundred one thousand, twenty-one".