22019999981 has 4 divisors (see below), whose sum is σ = 25165714272. Its totient is φ = 18874285692.

The previous prime is 22019999977. The next prime is 22020000007. The reversal of 22019999981 is 18999991022.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 22019999981 - 2² = 22019999977 is a prime.

It is a super-2 number, since 2×22019999981² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 22019999981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22019999951) 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 in 3 ways as a sum of consecutive naturals, for example, 1572857135 + ... + 1572857148.

It is an arithmetic number, because the mean of its divisors is an integer number (6291428568).

Almost surely, 2^22019999981 is an apocalyptic number.

It is an amenable number.

22019999981 is a deficient number, since it is larger than the sum of its proper divisors (3145714291).

22019999981 is an equidigital number, since it uses as much as digits as its factorization.

22019999981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3145714290.

The product of its (nonzero) digits is 1889568, while the sum is 59.

The spelling of 22019999981 in words is "twenty-two billion, nineteen million, nine hundred ninety-nine thousand, nine hundred eighty-one".