20122320121 has 2 divisors, whose sum is σ = 20122320122. Its totient is φ = 20122320120.

The previous prime is 20122320083. The next prime is 20122320173. The reversal of 20122320121 is 12102322102.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11158964496 + 8963355625 = 105636^2 + 94675^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20122320121 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20122320095 and 20122320104.

It is not a weakly prime, because it can be changed into another prime (20122320821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10061160060 + 10061160061.

It is an arithmetic number, because the mean of its divisors is an integer number (10061160061).

Almost surely, 2^20122320121 is an apocalyptic number.

It is an amenable number.

20122320121 is a deficient number, since it is larger than the sum of its proper divisors (1).

20122320121 is an equidigital number, since it uses as much as digits as its factorization.

20122320121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 20122320121 its reverse (12102322102), we get a palindrome (32224642223).

The spelling of 20122320121 in words is "twenty billion, one hundred twenty-two million, three hundred twenty thousand, one hundred twenty-one".