22100081 has 2 divisors, whose sum is σ = 22100082. Its totient is φ = 22100080.

The previous prime is 22100069. The next prime is 22100129. The reversal of 22100081 is 18000122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14371681 + 7728400 = 3791^2 + 2780^2 .

It is a cyclic number.

It is not a de Polignac number, because 22100081 - 2¹⁰ = 22099057 is a prime.

It is a super-2 number, since 2×22100081² = 976827160413122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (22100041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11050040 + 11050041.

It is an arithmetic number, because the mean of its divisors is an integer number (11050041).

Almost surely, 2^22100081 is an apocalyptic number.

It is an amenable number.

22100081 is a deficient number, since it is larger than the sum of its proper divisors (1).

22100081 is an equidigital number, since it uses as much as digits as its factorization.

22100081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 22100081 is about 4701.0723244809. The cubic root of 22100081 is about 280.6281856871.

The spelling of 22100081 in words is "twenty-two million, one hundred thousand, eighty-one".