22010209981 has 2 divisors, whose sum is σ = 22010209982. Its totient is φ = 22010209980.

The previous prime is 22010209967. The next prime is 22010210009. The reversal of 22010209981 is 18990201022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19776796900 + 2233413081 = 140630^2 + 47259^2 .

It is a cyclic number.

It is not a de Polignac number, because 22010209981 - 2¹⁹ = 22009685693 is a prime.

It is a super-2 number, since 2×22010209981² (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 (22010209951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11005104990 + 11005104991.

It is an arithmetic number, because the mean of its divisors is an integer number (11005104991).

Almost surely, 2^22010209981 is an apocalyptic number.

It is an amenable number.

22010209981 is a deficient number, since it is larger than the sum of its proper divisors (1).

22010209981 is an equidigital number, since it uses as much as digits as its factorization.

22010209981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 34.

The spelling of 22010209981 in words is "twenty-two billion, ten million, two hundred nine thousand, nine hundred eighty-one".