20123220001 has 2 divisors, whose sum is σ = 20123220002. Its totient is φ = 20123220000.

The previous prime is 20123219993. The next prime is 20123220037. The reversal of 20123220001 is 10002232102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10191104401 + 9932115600 = 100951^2 + 99660^2 .

It is a cyclic number.

It is not a de Polignac number, because 20123220001 - 2³ = 20123219993 is a prime.

It is not a weakly prime, because it can be changed into another prime (20163220001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10061610000 + 10061610001.

It is an arithmetic number, because the mean of its divisors is an integer number (10061610001).

Almost surely, 2^20123220001 is an apocalyptic number.

It is an amenable number.

20123220001 is a deficient number, since it is larger than the sum of its proper divisors (1).

20123220001 is an equidigital number, since it uses as much as digits as its factorization.

20123220001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 13.

Adding to 20123220001 its reverse (10002232102), we get a palindrome (30125452103).

The spelling of 20123220001 in words is "twenty billion, one hundred twenty-three million, two hundred twenty thousand, one".