22001220110021 has 6 divisors (see below), whose sum is σ = 23220124271622. Its totient is φ = 20843261156520.

The previous prime is 22001220110011. The next prime is 22001220110057. The reversal of 22001220110021 is 12001102210022.

It can be written as a sum of positive squares in only one way, i.e., 18036796650625 + 3964423459396 = 4246975^2 + 1991086^2 .

It is not a de Polignac number, because 22001220110021 - 2³⁰ = 22000146368197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22001220109978 and 22001220110005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22001220110011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 30472603670 + ... + 30472604391.

It is an arithmetic number, because the mean of its divisors is an integer number (3870020711937).

Almost surely, 2^{22001220110021} is an apocalyptic number.

It is an amenable number.

22001220110021 is a deficient number, since it is larger than the sum of its proper divisors (1218904161601).

22001220110021 is an equidigital number, since it uses as much as digits as its factorization.

22001220110021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60945208099 (or 60945208080 counting only the distinct ones).

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

Adding to 22001220110021 its reverse (12001102210022), we get a palindrome (34002322320043).

The spelling of 22001220110021 in words is "twenty-two trillion, one billion, two hundred twenty million, one hundred ten thousand, twenty-one".