21112011110087 has 2 divisors, whose sum is σ = 21112011110088. Its totient is φ = 21112011110086.

The previous prime is 21112011109999. The next prime is 21112011110171. The reversal of 21112011110087 is 78001111021112.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21112011110087 is a prime.

It is a super-2 number, since 2×21112011110087² (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 (21112011110387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556005555043 + 10556005555044.

It is an arithmetic number, because the mean of its divisors is an integer number (10556005555044).

Almost surely, 2^{21112011110087} is an apocalyptic number.

21112011110087 is a deficient number, since it is larger than the sum of its proper divisors (1).

21112011110087 is an equidigital number, since it uses as much as digits as its factorization.

21112011110087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 224, while the sum is 26.

Adding to 21112011110087 its reverse (78001111021112), we get a palindrome (99113122131199).

The spelling of 21112011110087 in words is "twenty-one trillion, one hundred twelve billion, eleven million, one hundred ten thousand, eighty-seven".