20221121022221 has 12 divisors (see below), whose sum is σ = 24333650211420. Its totient is φ = 16734720844800.

The previous prime is 20221121022191. The next prime is 20221121022229. The reversal of 20221121022221 is 12222012112202.

It can be written as a sum of positive squares in 2 ways, for example, as 5886378506596 + 14334742515625 = 2426186^2 + 3786125^2 .

It is not a de Polignac number, because 20221121022221 - 2³⁰ = 20220047280397 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20221121022193 and 20221121022202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20221121022229) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7115100980 + ... + 7115103821.

It is an arithmetic number, because the mean of its divisors is an integer number (2027804184285).

Almost surely, 2^{20221121022221} is an apocalyptic number.

It is an amenable number.

20221121022221 is a deficient number, since it is larger than the sum of its proper divisors (4112529189199).

20221121022221 is a wasteful number, since it uses less digits than its factorization.

20221121022221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14230204844 (or 14230204837 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 20221121022221 its reverse (12222012112202), we get a palindrome (32443133134423).

The spelling of 20221121022221 in words is "twenty trillion, two hundred twenty-one billion, one hundred twenty-one million, twenty-two thousand, two hundred twenty-one".