22121554909 has 2 divisors, whose sum is σ = 22121554910. Its totient is φ = 22121554908.

The previous prime is 22121554891. The next prime is 22121554991. The reversal of 22121554909 is 90945512122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19140722500 + 2980832409 = 138350^2 + 54597^2 .

It is a cyclic number.

It is not a de Polignac number, because 22121554909 - 2⁵ = 22121554877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22121554999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11060777454 + 11060777455.

It is an arithmetic number, because the mean of its divisors is an integer number (11060777455).

Almost surely, 2^22121554909 is an apocalyptic number.

It is an amenable number.

22121554909 is a deficient number, since it is larger than the sum of its proper divisors (1).

22121554909 is an equidigital number, since it uses as much as digits as its factorization.

22121554909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64800, while the sum is 40.

The spelling of 22121554909 in words is "twenty-two billion, one hundred twenty-one million, five hundred fifty-four thousand, nine hundred nine".