23110321021 has 2 divisors, whose sum is σ = 23110321022. Its totient is φ = 23110321020.

The previous prime is 23110321019. The next prime is 23110321079. The reversal of 23110321021 is 12012301132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20826819225 + 2283501796 = 144315^2 + 47786^2 .

It is a cyclic number.

It is not a de Polignac number, because 23110321021 - 2¹ = 23110321019 is a prime.

Together with 23110321019, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 23110320986 and 23110321004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23110021021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11555160510 + 11555160511.

It is an arithmetic number, because the mean of its divisors is an integer number (11555160511).

Almost surely, 2^23110321021 is an apocalyptic number.

It is an amenable number.

23110321021 is a deficient number, since it is larger than the sum of its proper divisors (1).

23110321021 is an equidigital number, since it uses as much as digits as its factorization.

23110321021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 23110321021 its reverse (12012301132), we get a palindrome (35122622153).

The spelling of 23110321021 in words is "twenty-three billion, one hundred ten million, three hundred twenty-one thousand, twenty-one".