20121232431 has 8 divisors (see below), whose sum is σ = 26939631664. Its totient is φ = 13358494080.

The previous prime is 20121232399. The next prime is 20121232451. The reversal of 20121232431 is 13423212102.

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

It is not a de Polignac number, because 20121232431 - 2⁵ = 20121232399 is a prime.

It is a super-2 number, since 2×20121232431² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20121232398 and 20121232407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121232451) 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, 13914376 + ... + 13915821.

It is an arithmetic number, because the mean of its divisors is an integer number (3367453958).

Almost surely, 2^20121232431 is an apocalyptic number.

20121232431 is a deficient number, since it is larger than the sum of its proper divisors (6818399233).

20121232431 is a wasteful number, since it uses less digits than its factorization.

20121232431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27830441.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 20121232431 its reverse (13423212102), we get a palindrome (33544444533).

The spelling of 20121232431 in words is "twenty billion, one hundred twenty-one million, two hundred thirty-two thousand, four hundred thirty-one".