21120207026797 has 2 divisors, whose sum is σ = 21120207026798. Its totient is φ = 21120207026796.

The previous prime is 21120207026771. The next prime is 21120207026801. The reversal of 21120207026797 is 79762070202112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17535750880041 + 3584456146756 = 4187571^2 + 1893266^2 .

It is a cyclic number.

It is not a de Polignac number, because 21120207026797 - 2³¹ = 21118059543149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21120207026717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560103513398 + 10560103513399.

It is an arithmetic number, because the mean of its divisors is an integer number (10560103513399).

Almost surely, 2^{21120207026797} is an apocalyptic number.

It is an amenable number.

21120207026797 is a deficient number, since it is larger than the sum of its proper divisors (1).

21120207026797 is an equidigital number, since it uses as much as digits as its factorization.

21120207026797 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 296352, while the sum is 46.

The spelling of 21120207026797 in words is "twenty-one trillion, one hundred twenty billion, two hundred seven million, twenty-six thousand, seven hundred ninety-seven".