20222120021 has 4 divisors (see below), whose sum is σ = 20226529344. Its totient is φ = 20217710700.

The previous prime is 20222120011. The next prime is 20222120047. The reversal of 20222120021 is 12002122202.

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 20222120021 - 2¹⁴ = 20222103637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20222119978 and 20222120005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20222120011) 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, 2197775 + ... + 2206956.

It is an arithmetic number, because the mean of its divisors is an integer number (5056632336).

Almost surely, 2^20222120021 is an apocalyptic number.

It is an amenable number.

20222120021 is a deficient number, since it is larger than the sum of its proper divisors (4409323).

20222120021 is an equidigital number, since it uses as much as digits as its factorization.

20222120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4409322.

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 20222120021 its reverse (12002122202), we get a palindrome (32224242223).

The spelling of 20222120021 in words is "twenty billion, two hundred twenty-two million, one hundred twenty thousand, twenty-one".