22021101981 has 12 divisors (see below), whose sum is σ = 31809610560. Its totient is φ = 14680110600.

The previous prime is 22021101959. The next prime is 22021102001. The reversal of 22021101981 is 18910112022.

It is not a de Polignac number, because 22021101981 - 2⁹ = 22021101469 is a prime.

It is a super-2 number, since 2×22021101981² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22021101481) 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 11 ways as a sum of consecutive naturals, for example, 289530 + ... + 357588.

It is an arithmetic number, because the mean of its divisors is an integer number (2650800880).

Almost surely, 2^22021101981 is an apocalyptic number.

It is an amenable number.

22021101981 is a deficient number, since it is larger than the sum of its proper divisors (9788508579).

22021101981 is a wasteful number, since it uses less digits than its factorization.

22021101981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104016 (or 104013 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 27.

The spelling of 22021101981 in words is "twenty-two billion, twenty-one million, one hundred one thousand, nine hundred eighty-one".