20540210321 has 2 divisors, whose sum is σ = 20540210322. Its totient is φ = 20540210320.

The previous prime is 20540210309. The next prime is 20540210347. The reversal of 20540210321 is 12301204502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18337222225 + 2202988096 = 135415^2 + 46936^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20540210321 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20540210293 and 20540210302.

It is not a weakly prime, because it can be changed into another prime (20540210371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10270105160 + 10270105161.

It is an arithmetic number, because the mean of its divisors is an integer number (10270105161).

Almost surely, 2^20540210321 is an apocalyptic number.

It is an amenable number.

20540210321 is a deficient number, since it is larger than the sum of its proper divisors (1).

20540210321 is an equidigital number, since it uses as much as digits as its factorization.

20540210321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 480, while the sum is 20.

Adding to 20540210321 its reverse (12301204502), we get a palindrome (32841414823).

The spelling of 20540210321 in words is "twenty billion, five hundred forty million, two hundred ten thousand, three hundred twenty-one".