123535315921 has 16 divisors (see below), whose sum is σ = 128658178048. Its totient is φ = 118485536400.

The previous prime is 123535315909. The next prime is 123535315957. The reversal of 123535315921 is 129513535321.

It is a cyclic number.

It is not a de Polignac number, because 123535315921 - 2⁷ = 123535315793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (123535315961) 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 15 ways as a sum of consecutive naturals, for example, 3885736 + ... + 3917398.

It is an arithmetic number, because the mean of its divisors is an integer number (8041136128).

Almost surely, 2^123535315921 is an apocalyptic number.

It is an amenable number.

123535315921 is a deficient number, since it is larger than the sum of its proper divisors (5122862127).

123535315921 is a wasteful number, since it uses less digits than its factorization.

123535315921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32812.

The product of its digits is 121500, while the sum is 40.

The spelling of 123535315921 in words is "one hundred twenty-three billion, five hundred thirty-five million, three hundred fifteen thousand, nine hundred twenty-one".