22212020021 has 16 divisors (see below), whose sum is σ = 23711429376. Its totient is φ = 20734311936.

The previous prime is 22212020003. The next prime is 22212020071. The reversal of 22212020021 is 12002021222.

It is not a de Polignac number, because 22212020021 - 2³⁰ = 21138278197 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 22212019978 and 22212020005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22212020071) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3086990 + ... + 3094176.

It is an arithmetic number, because the mean of its divisors is an integer number (1481964336).

Almost surely, 2^22212020021 is an apocalyptic number.

It is an amenable number.

22212020021 is a deficient number, since it is larger than the sum of its proper divisors (1499409355).

22212020021 is a wasteful number, since it uses less digits than its factorization.

22212020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8668.

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

Adding to 22212020021 its reverse (12002021222), we get a palindrome (34214041243).

The spelling of 22212020021 in words is "twenty-two billion, two hundred twelve million, twenty thousand, twenty-one".