20310011521 has 2 divisors, whose sum is σ = 20310011522. Its totient is φ = 20310011520.

The previous prime is 20310011489. The next prime is 20310011531. The reversal of 20310011521 is 12511001302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15967860496 + 4342151025 = 126364^2 + 65895^2 .

It is a cyclic number.

It is not a de Polignac number, because 20310011521 - 2⁵ = 20310011489 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20310011495 and 20310011504.

It is not a weakly prime, because it can be changed into another prime (20310011531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10155005760 + 10155005761.

It is an arithmetic number, because the mean of its divisors is an integer number (10155005761).

Almost surely, 2^20310011521 is an apocalyptic number.

It is an amenable number.

20310011521 is a deficient number, since it is larger than the sum of its proper divisors (1).

20310011521 is an equidigital number, since it uses as much as digits as its factorization.

20310011521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60, while the sum is 16.

Adding to 20310011521 its reverse (12511001302), we get a palindrome (32821012823).

The spelling of 20310011521 in words is "twenty billion, three hundred ten million, eleven thousand, five hundred twenty-one".