22021110665 has 4 divisors (see below), whose sum is σ = 26425332804. Its totient is φ = 17616888528.

The previous prime is 22021110659. The next prime is 22021110691. The reversal of 22021110665 is 56601112022.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14225809984 + 7795300681 = 119272^2 + 88291^2 .

It is a cyclic number.

It is not a de Polignac number, because 22021110665 - 2⁴ = 22021110649 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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, 2202111062 + ... + 2202111071.

It is an arithmetic number, because the mean of its divisors is an integer number (6606333201).

Almost surely, 2^22021110665 is an apocalyptic number.

It is an amenable number.

22021110665 is a deficient number, since it is larger than the sum of its proper divisors (4404222139).

22021110665 is an equidigital number, since it uses as much as digits as its factorization.

22021110665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4404222138.

The product of its (nonzero) digits is 1440, while the sum is 26.

Adding to 22021110665 its reverse (56601112022), we get a palindrome (78622222687).

The spelling of 22021110665 in words is "twenty-two billion, twenty-one million, one hundred ten thousand, six hundred sixty-five".