20111320101281 has 2 divisors, whose sum is σ = 20111320101282. Its totient is φ = 20111320101280.

The previous prime is 20111320101253. The next prime is 20111320101287. The reversal of 20111320101281 is 18210102311102.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17577190410256 + 2534129691025 = 4192516^2 + 1591895^2 .

It is a cyclic number.

It is not a de Polignac number, because 20111320101281 - 2¹⁰ = 20111320100257 is a prime.

It is a super-2 number, since 2×20111320101281² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20111320101287) 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, 10055660050640 + 10055660050641.

It is an arithmetic number, because the mean of its divisors is an integer number (10055660050641).

Almost surely, 2^{20111320101281} is an apocalyptic number.

It is an amenable number.

20111320101281 is a deficient number, since it is larger than the sum of its proper divisors (1).

20111320101281 is an equidigital number, since it uses as much as digits as its factorization.

20111320101281 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 23.

Adding to 20111320101281 its reverse (18210102311102), we get a palindrome (38321422412383).

The spelling of 20111320101281 in words is "twenty trillion, one hundred eleven billion, three hundred twenty million, one hundred one thousand, two hundred eighty-one".