22120221999509 has 2 divisors, whose sum is σ = 22120221999510. Its totient is φ = 22120221999508.

The previous prime is 22120221999503. The next prime is 22120221999517. The reversal of 22120221999509 is 90599912202122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15941254022500 + 6178967977009 = 3992650^2 + 2485753^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22120221999509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22120221999503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11060110999754 + 11060110999755.

It is an arithmetic number, because the mean of its divisors is an integer number (11060110999755).

Almost surely, 2^{22120221999509} is an apocalyptic number.

It is an amenable number.

22120221999509 is a deficient number, since it is larger than the sum of its proper divisors (1).

22120221999509 is an equidigital number, since it uses as much as digits as its factorization.

22120221999509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1049760, while the sum is 53.

The spelling of 22120221999509 in words is "twenty-two trillion, one hundred twenty billion, two hundred twenty-one million, nine hundred ninety-nine thousand, five hundred nine".