203840022181 has 2 divisors, whose sum is σ = 203840022182. Its totient is φ = 203840022180.

The previous prime is 203840022179. The next prime is 203840022227. The reversal of 203840022181 is 181220048302.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 181041740100 + 22798282081 = 425490^2 + 150991^2 .

It is a cyclic number.

It is not a de Polignac number, because 203840022181 - 2¹ = 203840022179 is a prime.

It is a super-2 number, since 2×203840022181² (a number of 23 digits) contains 22 as substring.

Together with 203840022179, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (203840022121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101920011090 + 101920011091.

It is an arithmetic number, because the mean of its divisors is an integer number (101920011091).

Almost surely, 2^203840022181 is an apocalyptic number.

It is an amenable number.

203840022181 is a deficient number, since it is larger than the sum of its proper divisors (1).

203840022181 is an equidigital number, since it uses as much as digits as its factorization.

203840022181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6144, while the sum is 31.

The spelling of 203840022181 in words is "two hundred three billion, eight hundred forty million, twenty-two thousand, one hundred eighty-one".