22021313221 has 4 divisors (see below), whose sum is σ = 22040819500. Its totient is φ = 22001806944.

The previous prime is 22021313219. The next prime is 22021313243. The reversal of 22021313221 is 12231312022.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12673130625 + 9348182596 = 112575^2 + 96686^2 .

It is a cyclic number.

It is not a de Polignac number, because 22021313221 - 2¹ = 22021313219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22021313201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9751446 + ... + 9753703.

It is an arithmetic number, because the mean of its divisors is an integer number (5510204875).

Almost surely, 2^22021313221 is an apocalyptic number.

It is an amenable number.

22021313221 is a deficient number, since it is larger than the sum of its proper divisors (19506279).

22021313221 is a wasteful number, since it uses less digits than its factorization.

22021313221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19506278.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 22021313221 its reverse (12231312022), we get a palindrome (34252625243).

The spelling of 22021313221 in words is "twenty-two billion, twenty-one million, three hundred thirteen thousand, two hundred twenty-one".