20111320101287 has 2 divisors, whose sum is σ = 20111320101288. Its totient is φ = 20111320101286.

The previous prime is 20111320101281. The next prime is 20111320101329. The reversal of 20111320101287 is 78210102311102.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20111320101287 - 2²⁴ = 20111303324071 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20111320101281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10055660050643 + 10055660050644.

It is an arithmetic number, because the mean of its divisors is an integer number (10055660050644).

Almost surely, 2^{20111320101287} is an apocalyptic number.

20111320101287 is a deficient number, since it is larger than the sum of its proper divisors (1).

20111320101287 is an equidigital number, since it uses as much as digits as its factorization.

20111320101287 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1344, while the sum is 29.

Adding to 20111320101287 its reverse (78210102311102), we get a palindrome (98321422412389).

The spelling of 20111320101287 in words is "twenty trillion, one hundred eleven billion, three hundred twenty million, one hundred one thousand, two hundred eighty-seven".