21535174323 has 48 divisors (see below), whose sum is σ = 34608960000. Its totient is φ = 13228611552.

The previous prime is 21535174307. The next prime is 21535174327. The reversal of 21535174323 is 32347153512.

21535174323 is a `hidden beast` number, since 21 + 535 + 1 + 74 + 32 + 3 = 666.

It is not a de Polignac number, because 21535174323 - 2⁴ = 21535174307 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21535174327) 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 47 ways as a sum of consecutive naturals, for example, 2729298 + ... + 2737176.

It is an arithmetic number, because the mean of its divisors is an integer number (721020000).

Almost surely, 2^21535174323 is an apocalyptic number.

21535174323 is a deficient number, since it is larger than the sum of its proper divisors (13073785677).

21535174323 is a wasteful number, since it uses less digits than its factorization.

21535174323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8513 (or 8494 counting only the distinct ones).

The product of its digits is 75600, while the sum is 36.

The spelling of 21535174323 in words is "twenty-one billion, five hundred thirty-five million, one hundred seventy-four thousand, three hundred twenty-three".