21120011097973 has 2 divisors, whose sum is σ = 21120011097974. Its totient is φ = 21120011097972.

The previous prime is 21120011097943. The next prime is 21120011097989. The reversal of 21120011097973 is 37979011002112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20265906122289 + 854104975684 = 4501767^2 + 924178^2 .

It is a cyclic number.

It is not a de Polignac number, because 21120011097973 - 2⁹ = 21120011097461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21120011097943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560005548986 + 10560005548987.

It is an arithmetic number, because the mean of its divisors is an integer number (10560005548987).

Almost surely, 2^{21120011097973} is an apocalyptic number.

It is an amenable number.

21120011097973 is a deficient number, since it is larger than the sum of its proper divisors (1).

21120011097973 is an equidigital number, since it uses as much as digits as its factorization.

21120011097973 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 47628, while the sum is 43.

The spelling of 21120011097973 in words is "twenty-one trillion, one hundred twenty billion, eleven million, ninety-seven thousand, nine hundred seventy-three".