20122223221 has 2 divisors, whose sum is σ = 20122223222. Its totient is φ = 20122223220.

The previous prime is 20122223203. The next prime is 20122223249. The reversal of 20122223221 is 12232222102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20102986225 + 19236996 = 141785^2 + 4386^2 .

It is a cyclic number.

It is not a de Polignac number, because 20122223221 - 2²⁹ = 19585352309 is a prime.

It is a super-2 number, since 2×20122223221² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20122223021) 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 as a sum of consecutive naturals, namely, 10061111610 + 10061111611.

It is an arithmetic number, because the mean of its divisors is an integer number (10061111611).

Almost surely, 2^20122223221 is an apocalyptic number.

It is an amenable number.

20122223221 is a deficient number, since it is larger than the sum of its proper divisors (1).

20122223221 is an equidigital number, since it uses as much as digits as its factorization.

20122223221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 20122223221 its reverse (12232222102), we get a palindrome (32354445323).

The spelling of 20122223221 in words is "twenty billion, one hundred twenty-two million, two hundred twenty-three thousand, two hundred twenty-one".