22000022120221 has 4 divisors (see below), whose sum is σ = 22000032452412. Its totient is φ = 22000011788032.

The previous prime is 22000022120203. The next prime is 22000022120299. The reversal of 22000022120221 is 12202122000022.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 13906850597721 + 8093171522500 = 3729189^2 + 2844850^2 .

It is a cyclic number.

It is not a de Polignac number, because 22000022120221 - 2⁹ = 22000022119709 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22000022120195 and 22000022120204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22000022120521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 664900 + ... + 6666493.

It is an arithmetic number, because the mean of its divisors is an integer number (5500008113103).

Almost surely, 2^{22000022120221} is an apocalyptic number.

It is an amenable number.

22000022120221 is a deficient number, since it is larger than the sum of its proper divisors (10332191).

22000022120221 is an equidigital number, since it uses as much as digits as its factorization.

22000022120221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10332190.

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 22000022120221 its reverse (12202122000022), we get a palindrome (34202144120243).

The spelling of 22000022120221 in words is "twenty-two trillion, twenty-two million, one hundred twenty thousand, two hundred twenty-one".