21112111019 has 2 divisors, whose sum is σ = 21112111020. Its totient is φ = 21112111018.

The previous prime is 21112110961. The next prime is 21112111021. The reversal of 21112111019 is 91011121112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21112111019 - 2⁸ = 21112110763 is a prime.

It is a super-2 number, since 2×21112111019² (a number of 21 digits) contains 22 as substring.

Together with 21112111021, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21112113019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556055509 + 10556055510.

It is an arithmetic number, because the mean of its divisors is an integer number (10556055510).

Almost surely, 2^21112111019 is an apocalyptic number.

21112111019 is a deficient number, since it is larger than the sum of its proper divisors (1).

21112111019 is an equidigital number, since it uses as much as digits as its factorization.

21112111019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 20.

The spelling of 21112111019 in words is "twenty-one billion, one hundred twelve million, one hundred eleven thousand, nineteen".