20021112211021 has 4 divisors (see below), whose sum is σ = 20021121707200. Its totient is φ = 20021102714844.

The previous prime is 20021112211013. The next prime is 20021112211033. The reversal of 20021112211021 is 12011221112002.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20021112211021 - 2³ = 20021112211013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20021112210986 and 20021112211004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021112241021) 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, 8661 + ... + 6327898.

It is an arithmetic number, because the mean of its divisors is an integer number (5005280426800).

Almost surely, 2^{20021112211021} is an apocalyptic number.

It is an amenable number.

20021112211021 is a deficient number, since it is larger than the sum of its proper divisors (9496179).

20021112211021 is an equidigital number, since it uses as much as digits as its factorization.

20021112211021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9496178.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 20021112211021 its reverse (12011221112002), we get a palindrome (32032333323023).

The spelling of 20021112211021 in words is "twenty trillion, twenty-one billion, one hundred twelve million, two hundred eleven thousand, twenty-one".