22354471981 has 2 divisors, whose sum is σ = 22354471982. Its totient is φ = 22354471980.

The previous prime is 22354471927. The next prime is 22354472009. The reversal of 22354471981 is 18917445322.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11344167081 + 11010304900 = 106509^2 + 104930^2 .

It is a cyclic number.

It is not a de Polignac number, because 22354471981 - 2²³ = 22346083373 is a prime.

It is a super-2 number, since 2×22354471981² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22354474981) 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, 11177235990 + 11177235991.

It is an arithmetic number, because the mean of its divisors is an integer number (11177235991).

Almost surely, 2^22354471981 is an apocalyptic number.

It is an amenable number.

22354471981 is a deficient number, since it is larger than the sum of its proper divisors (1).

22354471981 is an equidigital number, since it uses as much as digits as its factorization.

22354471981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 483840, while the sum is 46.

The spelling of 22354471981 in words is "twenty-two billion, three hundred fifty-four million, four hundred seventy-one thousand, nine hundred eighty-one".