22121211209 has 2 divisors, whose sum is σ = 22121211210. Its totient is φ = 22121211208.

The previous prime is 22121211181. The next prime is 22121211221. The reversal of 22121211209 is 90211212122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19098410809 + 3022800400 = 138197^2 + 54980^2 .

It is a cyclic number.

It is not a de Polignac number, because 22121211209 - 2⁸ = 22121210953 is a prime.

It is not a weakly prime, because it can be changed into another prime (22121211269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11060605604 + 11060605605.

It is an arithmetic number, because the mean of its divisors is an integer number (11060605605).

Almost surely, 2^22121211209 is an apocalyptic number.

It is an amenable number.

22121211209 is a deficient number, since it is larger than the sum of its proper divisors (1).

22121211209 is an equidigital number, since it uses as much as digits as its factorization.

22121211209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 23.

The spelling of 22121211209 in words is "twenty-two billion, one hundred twenty-one million, two hundred eleven thousand, two hundred nine".