21112012049 has 2 divisors, whose sum is σ = 21112012050. Its totient is φ = 21112012048.

The previous prime is 21112011917. The next prime is 21112012069. The reversal of 21112012049 is 94021021112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18166996225 + 2945015824 = 134785^2 + 54268^2 .

It is a cyclic number.

It is not a de Polignac number, because 21112012049 - 2²⁰ = 21110963473 is a prime.

It is not a weakly prime, because it can be changed into another prime (21112012069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556006024 + 10556006025.

It is an arithmetic number, because the mean of its divisors is an integer number (10556006025).

Almost surely, 2^21112012049 is an apocalyptic number.

It is an amenable number.

21112012049 is a deficient number, since it is larger than the sum of its proper divisors (1).

21112012049 is an equidigital number, since it uses as much as digits as its factorization.

21112012049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 23.

The spelling of 21112012049 in words is "twenty-one billion, one hundred twelve million, twelve thousand, forty-nine".