20021221120023 has 12 divisors (see below), whose sum is σ = 29990635752168. Its totient is φ = 13347480746520.

The previous prime is 20021221120013. The next prime is 20021221120037. The reversal of 20021221120023 is 32002112212002.

20021221120023 is a `hidden beast` number, since 20 + 0 + 212 + 211 + 200 + 23 = 666.

It is not a de Polignac number, because 20021221120023 - 2¹⁰ = 20021221118999 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20021221119978 and 20021221120005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021221120003) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 41195927988 + ... + 41195928473.

It is an arithmetic number, because the mean of its divisors is an integer number (2499219646014).

Almost surely, 2^{20021221120023} is an apocalyptic number.

20021221120023 is a deficient number, since it is larger than the sum of its proper divisors (9969414632145).

20021221120023 is an frugal number, since it uses more digits than its factorization.

20021221120023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82391856476 (or 82391856464 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 20021221120023 its reverse (32002112212002), we get a palindrome (52023333332025).

The spelling of 20021221120023 in words is "twenty trillion, twenty-one billion, two hundred twenty-one million, one hundred twenty thousand, twenty-three".