23431525320021 has 64 divisors (see below), whose sum is σ = 38988918829056. Its totient is φ = 12188014272000.

The previous prime is 23431525319989. The next prime is 23431525320029. The reversal of 23431525320021 is 12002352513432.

It is not a de Polignac number, because 23431525320021 - 2⁵ = 23431525319989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23431525320029) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3573066 + ... + 7722036.

It is an arithmetic number, because the mean of its divisors is an integer number (609201856704).

Almost surely, 2^{23431525320021} is an apocalyptic number.

23431525320021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

23431525320021 is a deficient number, since it is larger than the sum of its proper divisors (15557393509035).

23431525320021 is a wasteful number, since it uses less digits than its factorization.

23431525320021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4149282.

The product of its (nonzero) digits is 43200, while the sum is 33.

Adding to 23431525320021 its reverse (12002352513432), we get a palindrome (35433877833453).

The spelling of 23431525320021 in words is "twenty-three trillion, four hundred thirty-one billion, five hundred twenty-five million, three hundred twenty thousand, twenty-one".