202111221973 has 2 divisors, whose sum is σ = 202111221974. Its totient is φ = 202111221972.

The previous prime is 202111221911. The next prime is 202111221989. The reversal of 202111221973 is 379122111202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 194130122404 + 7981099569 = 440602^2 + 89337^2 .

It is a cyclic number.

It is not a de Polignac number, because 202111221973 - 2⁹ = 202111221461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (202111221173) 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, 101055610986 + 101055610987.

It is an arithmetic number, because the mean of its divisors is an integer number (101055610987).

Almost surely, 2^202111221973 is an apocalyptic number.

It is an amenable number.

202111221973 is a deficient number, since it is larger than the sum of its proper divisors (1).

202111221973 is an equidigital number, since it uses as much as digits as its factorization.

202111221973 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 31.

The spelling of 202111221973 in words is "two hundred two billion, one hundred eleven million, two hundred twenty-one thousand, nine hundred seventy-three".