21323315434523 has 8 divisors (see below), whose sum is σ = 22598322561360. Its totient is φ = 20050607691520.

The previous prime is 21323315434501. The next prime is 21323315434543. The reversal of 21323315434523 is 32543451332312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21323315434523 - 2²² = 21323311240219 is a prime.

It is a super-2 number, since 2×21323315434523² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21323315434543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 574826858 + ... + 574863951.

It is an arithmetic number, because the mean of its divisors is an integer number (2824790320170).

Almost surely, 2^{21323315434523} is an apocalyptic number.

21323315434523 is a deficient number, since it is larger than the sum of its proper divisors (1275007126837).

21323315434523 is a wasteful number, since it uses less digits than its factorization.

21323315434523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1149691917.

The product of its digits is 777600, while the sum is 41.

Adding to 21323315434523 its reverse (32543451332312), we get a palindrome (53866766766835).

The spelling of 21323315434523 in words is "twenty-one trillion, three hundred twenty-three billion, three hundred fifteen million, four hundred thirty-four thousand, five hundred twenty-three".