23123543521 has 8 divisors (see below), whose sum is σ = 24950082024. Its totient is φ = 21303834240.

The previous prime is 23123543507. The next prime is 23123543537. The reversal of 23123543521 is 12534532132.

It can be written as a sum of positive squares in 4 ways, for example, as 587529121 + 22536014400 = 24239^2 + 150120^2 .

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

It is not a de Polignac number, because 23123543521 - 2⁷ = 23123543393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23123543551) 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, 1700266 + ... + 1713811.

It is an arithmetic number, because the mean of its divisors is an integer number (3118760253).

Almost surely, 2^23123543521 is an apocalyptic number.

It is an amenable number.

23123543521 is a deficient number, since it is larger than the sum of its proper divisors (1826538503).

23123543521 is a wasteful number, since it uses less digits than its factorization.

23123543521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3414611.

The product of its digits is 21600, while the sum is 31.

The spelling of 23123543521 in words is "twenty-three billion, one hundred twenty-three million, five hundred forty-three thousand, five hundred twenty-one".