123503521101 has 4 divisors (see below), whose sum is σ = 164671361472. Its totient is φ = 82335680732.

The previous prime is 123503521069. The next prime is 123503521109. The reversal of 123503521101 is 101125305321.

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 123503521101 - 2⁵ = 123503521069 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123503521109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20583920181 + ... + 20583920186.

It is an arithmetic number, because the mean of its divisors is an integer number (41167840368).

Almost surely, 2^123503521101 is an apocalyptic number.

It is an amenable number.

123503521101 is a deficient number, since it is larger than the sum of its proper divisors (41167840371).

123503521101 is an equidigital number, since it uses as much as digits as its factorization.

123503521101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41167840370.

The product of its (nonzero) digits is 900, while the sum is 24.

Adding to 123503521101 its reverse (101125305321), we get a palindrome (224628826422).

The spelling of 123503521101 in words is "one hundred twenty-three billion, five hundred three million, five hundred twenty-one thousand, one hundred one".