20403010321 has 2 divisors, whose sum is σ = 20403010322. Its totient is φ = 20403010320.

The previous prime is 20403010289. The next prime is 20403010367. The reversal of 20403010321 is 12301030402.

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., 20295991296 + 107019025 = 142464^2 + 10345^2 .

It is a cyclic number.

It is not a de Polignac number, because 20403010321 - 2⁵ = 20403010289 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20403010295 and 20403010304.

It is not a weakly prime, because it can be changed into another prime (20403010021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10201505160 + 10201505161.

It is an arithmetic number, because the mean of its divisors is an integer number (10201505161).

Almost surely, 2^20403010321 is an apocalyptic number.

It is an amenable number.

20403010321 is a deficient number, since it is larger than the sum of its proper divisors (1).

20403010321 is an equidigital number, since it uses as much as digits as its factorization.

20403010321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 20403010321 its reverse (12301030402), we get a palindrome (32704040723).

The spelling of 20403010321 in words is "twenty billion, four hundred three million, ten thousand, three hundred twenty-one".