20121331231 has 8 divisors (see below), whose sum is σ = 21331769984. Its totient is φ = 18945977760.

The previous prime is 20121331211. The next prime is 20121331249. The reversal of 20121331231 is 13213312102.

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

It is a cyclic number.

It is not a de Polignac number, because 20121331231 - 2⁷ = 20121331103 is a prime.

It is a super-2 number, since 2×20121331231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20121331199 and 20121331208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121331211) 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 7 ways as a sum of consecutive naturals, for example, 8770140 + ... + 8772433.

It is an arithmetic number, because the mean of its divisors is an integer number (2666471248).

Almost surely, 2^20121331231 is an apocalyptic number.

20121331231 is a deficient number, since it is larger than the sum of its proper divisors (1210438753).

20121331231 is a wasteful number, since it uses less digits than its factorization.

20121331231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17542641.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 20121331231 its reverse (13213312102), we get a palindrome (33334643333).

The spelling of 20121331231 in words is "twenty billion, one hundred twenty-one million, three hundred thirty-one thousand, two hundred thirty-one".