123297821305 has 4 divisors (see below), whose sum is σ = 147957385572. Its totient is φ = 98638257040.

The previous prime is 123297821303. The next prime is 123297821321. The reversal of 123297821305 is 503128792321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 503128792321 = 17 ⋅29595811313.

It can be written as a sum of positive squares in 2 ways, for example, as 30533718121 + 92764103184 = 174739^2 + 304572^2 .

It is not a de Polignac number, because 123297821305 - 2¹ = 123297821303 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123297821303) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12329782126 + ... + 12329782135.

It is an arithmetic number, because the mean of its divisors is an integer number (36989346393).

Almost surely, 2^123297821305 is an apocalyptic number.

It is an amenable number.

123297821305 is a deficient number, since it is larger than the sum of its proper divisors (24659564267).

123297821305 is an equidigital number, since it uses as much as digits as its factorization.

123297821305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24659564266.

The product of its (nonzero) digits is 181440, while the sum is 43.

The spelling of 123297821305 in words is "one hundred twenty-three billion, two hundred ninety-seven million, eight hundred twenty-one thousand, three hundred five".