201222121889 has 2 divisors, whose sum is σ = 201222121890. Its totient is φ = 201222121888.

The previous prime is 201222121819. The next prime is 201222121897. The reversal of 201222121889 is 988121222102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 178344046864 + 22878075025 = 422308^2 + 151255^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201222121889 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (201222121819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100611060944 + 100611060945.

It is an arithmetic number, because the mean of its divisors is an integer number (100611060945).

Almost surely, 2^201222121889 is an apocalyptic number.

It is an amenable number.

201222121889 is a deficient number, since it is larger than the sum of its proper divisors (1).

201222121889 is an equidigital number, since it uses as much as digits as its factorization.

201222121889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18432, while the sum is 38.

The spelling of 201222121889 in words is "two hundred one billion, two hundred twenty-two million, one hundred twenty-one thousand, eight hundred eighty-nine".