20220123221 has 4 divisors (see below), whose sum is σ = 21409542252. Its totient is φ = 19030704192.

The previous prime is 20220123199. The next prime is 20220123281. The reversal of 20220123221 is 12232102202.

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 10854722596 + 9365400625 = 104186^2 + 96775^2 .

It is a cyclic number.

It is not a de Polignac number, because 20220123221 - 2³⁴ = 3040254037 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 1189419013 = 20220123221 / (2 + 0 + 2 + 2 + 0 + 1 + 2 + 3 + 2 + 2 + 1).

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20220123221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20220123281) by changing a digit.

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, 594709490 + ... + 594709523.

It is an arithmetic number, because the mean of its divisors is an integer number (5352385563).

Almost surely, 2^20220123221 is an apocalyptic number.

It is an amenable number.

20220123221 is a deficient number, since it is larger than the sum of its proper divisors (1189419031).

20220123221 is a wasteful number, since it uses less digits than its factorization.

20220123221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1189419030.

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 20220123221 its reverse (12232102202), we get a palindrome (32452225423).

The spelling of 20220123221 in words is "twenty billion, two hundred twenty million, one hundred twenty-three thousand, two hundred twenty-one".