20313222231221 has 2 divisors, whose sum is σ = 20313222231222. Its totient is φ = 20313222231220.

The previous prime is 20313222231217. The next prime is 20313222231227. The reversal of 20313222231221 is 12213222231302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13409145422500 + 6904076808721 = 3661850^2 + 2627561^2 .

It is a cyclic number.

It is not a de Polignac number, because 20313222231221 - 2² = 20313222231217 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20313222231227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10156611115610 + 10156611115611.

It is an arithmetic number, because the mean of its divisors is an integer number (10156611115611).

Almost surely, 2^{20313222231221} is an apocalyptic number.

It is an amenable number.

20313222231221 is a deficient number, since it is larger than the sum of its proper divisors (1).

20313222231221 is an equidigital number, since it uses as much as digits as its factorization.

20313222231221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 26.

Adding to 20313222231221 its reverse (12213222231302), we get a palindrome (32526444462523).

The spelling of 20313222231221 in words is "twenty trillion, three hundred thirteen billion, two hundred twenty-two million, two hundred thirty-one thousand, two hundred twenty-one".