22121099989 has 2 divisors, whose sum is σ = 22121099990. Its totient is φ = 22121099988.

The previous prime is 22121099981. The next prime is 22121100013. The reversal of 22121099989 is 98999012122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14969522500 + 7151577489 = 122350^2 + 84567^2 .

It is a cyclic number.

It is not a de Polignac number, because 22121099989 - 2³ = 22121099981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22121099981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11060549994 + 11060549995.

It is an arithmetic number, because the mean of its divisors is an integer number (11060549995).

Almost surely, 2^22121099989 is an apocalyptic number.

It is an amenable number.

22121099989 is a deficient number, since it is larger than the sum of its proper divisors (1).

22121099989 is an equidigital number, since it uses as much as digits as its factorization.

22121099989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 419904, while the sum is 52.

The spelling of 22121099989 in words is "twenty-two billion, one hundred twenty-one million, ninety-nine thousand, nine hundred eighty-nine".