20123231132421 has 24 divisors (see below), whose sum is σ = 29393874095040. Its totient is φ = 13264575420096.

The previous prime is 20123231132401. The next prime is 20123231132423. The reversal of 20123231132421 is 12423113232102.

20123231132421 is a `hidden beast` number, since 2 + 0 + 1 + 2 + 3 + 2 + 311 + 324 + 21 = 666.

It is not a de Polignac number, because 20123231132421 - 2⁷ = 20123231132293 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20123231132423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 91799670 + ... + 92018616.

It is an arithmetic number, because the mean of its divisors is an integer number (1224744753960).

Almost surely, 2^{20123231132421} is an apocalyptic number.

It is an amenable number.

20123231132421 is a deficient number, since it is larger than the sum of its proper divisors (9270642962619).

20123231132421 is a wasteful number, since it uses less digits than its factorization.

20123231132421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333785 (or 333782 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

Adding to 20123231132421 its reverse (12423113232102), we get a palindrome (32546344364523).

The spelling of 20123231132421 in words is "twenty trillion, one hundred twenty-three billion, two hundred thirty-one million, one hundred thirty-two thousand, four hundred twenty-one".