20443122221 has 16 divisors (see below), whose sum is σ = 21913900800. Its totient is φ = 19035027648.

The previous prime is 20443122197. The next prime is 20443122233. The reversal of 20443122221 is 12222134402.

It is a cyclic number.

It is not a de Polignac number, because 20443122221 - 2⁶ = 20443122157 is a prime.

It is a super-2 number, since 2×20443122221² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20443122281) 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 15 ways as a sum of consecutive naturals, for example, 5246 + ... + 202271.

It is an arithmetic number, because the mean of its divisors is an integer number (1369618800).

Almost surely, 2^20443122221 is an apocalyptic number.

It is an amenable number.

20443122221 is a deficient number, since it is larger than the sum of its proper divisors (1470778579).

20443122221 is a wasteful number, since it uses less digits than its factorization.

20443122221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207668.

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 20443122221 its reverse (12222134402), we get a palindrome (32665256623).

The spelling of 20443122221 in words is "twenty billion, four hundred forty-three million, one hundred twenty-two thousand, two hundred twenty-one".