21612112047073 has 2 divisors, whose sum is σ = 21612112047074. Its totient is φ = 21612112047072.

The previous prime is 21612112047061. The next prime is 21612112047079. The reversal of 21612112047073 is 37074021121612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21601747381824 + 10364665249 = 4647768^2 + 101807^2 .

It is a cyclic number.

It is not a de Polignac number, because 21612112047073 - 2²⁹ = 21611575176161 is a prime.

It is not a weakly prime, because it can be changed into another prime (21612112047079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10806056023536 + 10806056023537.

It is an arithmetic number, because the mean of its divisors is an integer number (10806056023537).

Almost surely, 2^{21612112047073} is an apocalyptic number.

It is an amenable number.

21612112047073 is a deficient number, since it is larger than the sum of its proper divisors (1).

21612112047073 is an equidigital number, since it uses as much as digits as its factorization.

21612112047073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28224, while the sum is 37.

Adding to 21612112047073 its reverse (37074021121612), we get a palindrome (58686133168685).

The spelling of 21612112047073 in words is "twenty-one trillion, six hundred twelve billion, one hundred twelve million, forty-seven thousand, seventy-three".