20420321334121 has 2 divisors, whose sum is σ = 20420321334122. Its totient is φ = 20420321334120.

The previous prime is 20420321334097. The next prime is 20420321334137. The reversal of 20420321334121 is 12143312302402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17290535759721 + 3129785574400 = 4158189^2 + 1769120^2 .

It is a cyclic number.

It is not a de Polignac number, because 20420321334121 - 2¹⁷ = 20420321203049 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20420321334121.

It is not a weakly prime, because it can be changed into another prime (20420321334221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10210160667060 + 10210160667061.

It is an arithmetic number, because the mean of its divisors is an integer number (10210160667061).

Almost surely, 2^{20420321334121} is an apocalyptic number.

It is an amenable number.

20420321334121 is a deficient number, since it is larger than the sum of its proper divisors (1).

20420321334121 is an equidigital number, since it uses as much as digits as its factorization.

20420321334121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 28.

Adding to 20420321334121 its reverse (12143312302402), we get a palindrome (32563633636523).

The spelling of 20420321334121 in words is "twenty trillion, four hundred twenty billion, three hundred twenty-one million, three hundred thirty-four thousand, one hundred twenty-one".