21110530100321 has 2 divisors, whose sum is σ = 21110530100322. Its totient is φ = 21110530100320.

The previous prime is 21110530100227. The next prime is 21110530100327. The reversal of 21110530100321 is 12300103501112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15949959187600 + 5160570912721 = 3993740^2 + 2271689^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21110530100321 is a prime.

It is a super-2 number, since 2×21110530100321² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21110530100293 and 21110530100302.

It is not a weakly prime, because it can be changed into another prime (21110530100327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10555265050160 + 10555265050161.

It is an arithmetic number, because the mean of its divisors is an integer number (10555265050161).

Almost surely, 2^{21110530100321} is an apocalyptic number.

It is an amenable number.

21110530100321 is a deficient number, since it is larger than the sum of its proper divisors (1).

21110530100321 is an equidigital number, since it uses as much as digits as its factorization.

21110530100321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 180, while the sum is 20.

Adding to 21110530100321 its reverse (12300103501112), we get a palindrome (33410633601433).

The spelling of 21110530100321 in words is "twenty-one trillion, one hundred ten billion, five hundred thirty million, one hundred thousand, three hundred twenty-one".