21100012113287 has 2 divisors, whose sum is σ = 21100012113288. Its totient is φ = 21100012113286.

The previous prime is 21100012113281. The next prime is 21100012113307. The reversal of 21100012113287 is 78231121000112.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21100012113287 is a prime.

It is a super-2 number, since 2×21100012113287² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21100012113281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550006056643 + 10550006056644.

It is an arithmetic number, because the mean of its divisors is an integer number (10550006056644).

Almost surely, 2^{21100012113287} is an apocalyptic number.

21100012113287 is a deficient number, since it is larger than the sum of its proper divisors (1).

21100012113287 is an equidigital number, since it uses as much as digits as its factorization.

21100012113287 is an evil number, because the sum of its binary digits is even.

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

Adding to 21100012113287 its reverse (78231121000112), we get a palindrome (99331133113399).

The spelling of 21100012113287 in words is "twenty-one trillion, one hundred billion, twelve million, one hundred thirteen thousand, two hundred eighty-seven".