123352340521 has 4 divisors (see below), whose sum is σ = 123382629972. Its totient is φ = 123322051072.

The previous prime is 123352340509. The next prime is 123352340557. The reversal of 123352340521 is 125043253321.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 57885954025 + 65466386496 = 240595^2 + 255864^2 .

It is a cyclic number.

It is not a de Polignac number, because 123352340521 - 2⁹ = 123352340009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123352349521) 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 in 3 ways as a sum of consecutive naturals, for example, 15138616 + ... + 15146761.

It is an arithmetic number, because the mean of its divisors is an integer number (30845657493).

Almost surely, 2^123352340521 is an apocalyptic number.

It is an amenable number.

123352340521 is a deficient number, since it is larger than the sum of its proper divisors (30289451).

123352340521 is an equidigital number, since it uses as much as digits as its factorization.

123352340521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30289450.

The product of its (nonzero) digits is 21600, while the sum is 31.

Adding to 123352340521 its reverse (125043253321), we get a palindrome (248395593842).

The spelling of 123352340521 in words is "one hundred twenty-three billion, three hundred fifty-two million, three hundred forty thousand, five hundred twenty-one".