20022231221 has 2 divisors, whose sum is σ = 20022231222. Its totient is φ = 20022231220.

The previous prime is 20022231211. The next prime is 20022231233. The reversal of 20022231221 is 12213222002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10994571025 + 9027660196 = 104855^2 + 95014^2 .

It is a cyclic number.

It is not a de Polignac number, because 20022231221 - 2¹⁰ = 20022230197 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20022231221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20022231211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10011115610 + 10011115611.

It is an arithmetic number, because the mean of its divisors is an integer number (10011115611).

Almost surely, 2^20022231221 is an apocalyptic number.

It is an amenable number.

20022231221 is a deficient number, since it is larger than the sum of its proper divisors (1).

20022231221 is an equidigital number, since it uses as much as digits as its factorization.

20022231221 is an odious number, because the sum of its binary digits is odd.

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

Adding to 20022231221 its reverse (12213222002), we get a palindrome (32235453223).

The spelling of 20022231221 in words is "twenty billion, twenty-two million, two hundred thirty-one thousand, two hundred twenty-one".