123540354321 has 4 divisors (see below), whose sum is σ = 164720472432. Its totient is φ = 82360236212.

The previous prime is 123540354317. The next prime is 123540354331. The reversal of 123540354321 is 123453045321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 123540354321 - 2² = 123540354317 is a prime.

It is not an unprimeable number, because it can be changed into a prime (123540354331) 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, 20590059051 + ... + 20590059056.

It is an arithmetic number, because the mean of its divisors is an integer number (41180118108).

Almost surely, 2^123540354321 is an apocalyptic number.

It is an amenable number.

123540354321 is a deficient number, since it is larger than the sum of its proper divisors (41180118111).

123540354321 is an equidigital number, since it uses as much as digits as its factorization.

123540354321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41180118110.

The product of its (nonzero) digits is 43200, while the sum is 33.

Adding to 123540354321 its reverse (123453045321), we get a palindrome (246993399642).

The spelling of 123540354321 in words is "one hundred twenty-three billion, five hundred forty million, three hundred fifty-four thousand, three hundred twenty-one".