20021302331161 has 2 divisors, whose sum is σ = 20021302331162. Its totient is φ = 20021302331160.

The previous prime is 20021302331143. The next prime is 20021302331189. The reversal of 20021302331161 is 16113320312002.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13592826054025 + 6428476277136 = 3686845^2 + 2535444^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20021302331161 is a prime.

It is not a weakly prime, because it can be changed into another prime (20021302331561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010651165580 + 10010651165581.

It is an arithmetic number, because the mean of its divisors is an integer number (10010651165581).

Almost surely, 2^{20021302331161} is an apocalyptic number.

It is an amenable number.

20021302331161 is a deficient number, since it is larger than the sum of its proper divisors (1).

20021302331161 is an equidigital number, since it uses as much as digits as its factorization.

20021302331161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 25.

Adding to 20021302331161 its reverse (16113320312002), we get a palindrome (36134622643163).

The spelling of 20021302331161 in words is "twenty trillion, twenty-one billion, three hundred two million, three hundred thirty-one thousand, one hundred sixty-one".