21231404321023 has 32 divisors (see below), whose sum is σ = 23637559668800. Its totient is φ = 19058835938688.

The previous prime is 21231404320877. The next prime is 21231404321087. The reversal of 21231404321023 is 32012340413212.

It is a de Polignac number, because none of the positive numbers 2^k-21231404321023 is a prime.

It is a super-3 number, since 3×21231404321023³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21231404320982 and 21231404321000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21231404321723) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21143161 + ... + 22124557.

It is an arithmetic number, because the mean of its divisors is an integer number (738673739650).

Almost surely, 2^{21231404321023} is an apocalyptic number.

21231404321023 is a deficient number, since it is larger than the sum of its proper divisors (2406155347777).

21231404321023 is an equidigital number, since it uses as much as digits as its factorization.

21231404321023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 981708 (or 981682 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 28.

Adding to 21231404321023 its reverse (32012340413212), we get a palindrome (53243744734235).

The spelling of 21231404321023 in words is "twenty-one trillion, two hundred thirty-one billion, four hundred four million, three hundred twenty-one thousand, twenty-three".