20021110222021 has 4 divisors (see below), whose sum is σ = 20033476567200. Its totient is φ = 20008743876844.

The previous prime is 20021110221989. The next prime is 20021110222027. The reversal of 20021110222021 is 12022201112002.

It is a happy number.

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 20021110222021 - 2⁵ = 20021110221989 is a prime.

It is a super-4 number, since 4×20021110222021⁴ (a number of 54 digits) contains 4444 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20021110221986 and 20021110222004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021110222027) 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, 6183170161 + ... + 6183173398.

It is an arithmetic number, because the mean of its divisors is an integer number (5008369141800).

Almost surely, 2^{20021110222021} is an apocalyptic number.

It is an amenable number.

20021110222021 is a deficient number, since it is larger than the sum of its proper divisors (12366345179).

20021110222021 is a wasteful number, since it uses less digits than its factorization.

20021110222021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12366345178.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 20021110222021 its reverse (12022201112002), we get a palindrome (32043311334023).

The spelling of 20021110222021 in words is "twenty trillion, twenty-one billion, one hundred ten million, two hundred twenty-two thousand, twenty-one".