20200122221 has 4 divisors (see below), whose sum is σ = 20202197244. Its totient is φ = 20198047200.

The previous prime is 20200122197. The next prime is 20200122247. The reversal of 20200122221 is 12222100202.

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 14098950121 + 6101172100 = 118739^2 + 78110^2 .

It is a cyclic number.

It is not a de Polignac number, because 20200122221 - 2²⁶ = 20133013357 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20200122196 and 20200122205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20200122281) 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, 1022840 + ... + 1042401.

It is an arithmetic number, because the mean of its divisors is an integer number (5050549311).

Almost surely, 2^20200122221 is an apocalyptic number.

It is an amenable number.

20200122221 is a deficient number, since it is larger than the sum of its proper divisors (2075023).

20200122221 is an equidigital number, since it uses as much as digits as its factorization.

20200122221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2075022.

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 20200122221 its reverse (12222100202), we get a palindrome (32422222423).

The spelling of 20200122221 in words is "twenty billion, two hundred million, one hundred twenty-two thousand, two hundred twenty-one".