22121002009 has 2 divisors, whose sum is σ = 22121002010. Its totient is φ = 22121002008.

The previous prime is 22121001989. The next prime is 22121002019. The reversal of 22121002009 is 90020012122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14655523600 + 7465478409 = 121060^2 + 86403^2 .

It is a cyclic number.

It is not a de Polignac number, because 22121002009 - 2¹⁹ = 22120477721 is a prime.

It is not a weakly prime, because it can be changed into another prime (22121002019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11060501004 + 11060501005.

It is an arithmetic number, because the mean of its divisors is an integer number (11060501005).

Almost surely, 2^22121002009 is an apocalyptic number.

It is an amenable number.

22121002009 is a deficient number, since it is larger than the sum of its proper divisors (1).

22121002009 is an equidigital number, since it uses as much as digits as its factorization.

22121002009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 19.

The spelling of 22121002009 in words is "twenty-two billion, one hundred twenty-one million, two thousand, nine".