23481390221 has 2 divisors, whose sum is σ = 23481390222. Its totient is φ = 23481390220.

The previous prime is 23481390197. The next prime is 23481390259. The reversal of 23481390221 is 12209318432.

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., 23430424900 + 50965321 = 153070^2 + 7139^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23481390221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23481390271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11740695110 + 11740695111.

It is an arithmetic number, because the mean of its divisors is an integer number (11740695111).

Almost surely, 2^23481390221 is an apocalyptic number.

It is an amenable number.

23481390221 is a deficient number, since it is larger than the sum of its proper divisors (1).

23481390221 is an equidigital number, since it uses as much as digits as its factorization.

23481390221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 35.

The spelling of 23481390221 in words is "twenty-three billion, four hundred eighty-one million, three hundred ninety thousand, two hundred twenty-one".