22022031221 has 4 divisors (see below), whose sum is σ = 22617221292. Its totient is φ = 21426841152.

The previous prime is 22022031209. The next prime is 22022031257. The reversal of 22022031221 is 12213022022.

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 21166176196 + 855855025 = 145486^2 + 29255^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22022031221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 22022031221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22022031121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 297594980 + ... + 297595053.

It is an arithmetic number, because the mean of its divisors is an integer number (5654305323).

Almost surely, 2^22022031221 is an apocalyptic number.

It is an amenable number.

22022031221 is a deficient number, since it is larger than the sum of its proper divisors (595190071).

22022031221 is an equidigital number, since it uses as much as digits as its factorization.

22022031221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 595190070.

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 22022031221 its reverse (12213022022), we get a palindrome (34235053243).

The spelling of 22022031221 in words is "twenty-two billion, twenty-two million, thirty-one thousand, two hundred twenty-one".