20321121001 has 2 divisors, whose sum is σ = 20321121002. Its totient is φ = 20321121000.

The previous prime is 20321120957. The next prime is 20321121013. The reversal of 20321121001 is 10012112302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14334075625 + 5987045376 = 119725^2 + 77376^2 .

It is a cyclic number.

It is not a de Polignac number, because 20321121001 - 2²⁷ = 20186903273 is a prime.

It is not a weakly prime, because it can be changed into another prime (20321124001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10160560500 + 10160560501.

It is an arithmetic number, because the mean of its divisors is an integer number (10160560501).

Almost surely, 2^20321121001 is an apocalyptic number.

It is an amenable number.

20321121001 is a deficient number, since it is larger than the sum of its proper divisors (1).

20321121001 is an equidigital number, since it uses as much as digits as its factorization.

20321121001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 20321121001 its reverse (10012112302), we get a palindrome (30333233303).

The spelling of 20321121001 in words is "twenty billion, three hundred twenty-one million, one hundred twenty-one thousand, one".