21231432234423 has 24 divisors (see below), whose sum is σ = 30750617108640. Its totient is φ = 14115985715520.

The previous prime is 21231432234349. The next prime is 21231432234427. The reversal of 21231432234423 is 32443223413212.

21231432234423 is a `hidden beast` number, since 2 + 1 + 2 + 3 + 1 + 4 + 3 + 223 + 4 + 423 = 666.

It is not a de Polignac number, because 21231432234423 - 2¹⁷ = 21231432103351 is a prime.

It is a super-4 number, since 4×21231432234423⁴ (a number of 54 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21231432234427) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 256503918 + ... + 256586676.

It is an arithmetic number, because the mean of its divisors is an integer number (1281275712860).

Almost surely, 2^{21231432234423} is an apocalyptic number.

21231432234423 is a deficient number, since it is larger than the sum of its proper divisors (9519184874217).

21231432234423 is a wasteful number, since it uses less digits than its factorization.

21231432234423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159559 (or 159556 counting only the distinct ones).

The product of its digits is 165888, while the sum is 36.

Adding to 21231432234423 its reverse (32443223413212), we get a palindrome (53674655647635).

The spelling of 21231432234423 in words is "twenty-one trillion, two hundred thirty-one billion, four hundred thirty-two million, two hundred thirty-four thousand, four hundred twenty-three".