21112019878927 has 2 divisors, whose sum is σ = 21112019878928. Its totient is φ = 21112019878926.

The previous prime is 21112019878877. The next prime is 21112019878969. The reversal of 21112019878927 is 72987891021112.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21112019878927 - 2¹¹ = 21112019876879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21112019878127) 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, 10556009939463 + 10556009939464.

It is an arithmetic number, because the mean of its divisors is an integer number (10556009939464).

Almost surely, 2^{21112019878927} is an apocalyptic number.

21112019878927 is a deficient number, since it is larger than the sum of its proper divisors (1).

21112019878927 is an equidigital number, since it uses as much as digits as its factorization.

21112019878927 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2032128, while the sum is 58.

The spelling of 21112019878927 in words is "twenty-one trillion, one hundred twelve billion, nineteen million, eight hundred seventy-eight thousand, nine hundred twenty-seven".