231221031123042 has 32 divisors (see below), whose sum is σ = 513903309744960. Its totient is φ = 77061857620320.

The previous prime is 231221031123041. The next prime is 231221031123067. The reversal of 231221031123042 is 240321130122132.

231221031123042 is a `hidden beast` number, since 2 + 31 + 2 + 2 + 10 + 311 + 2 + 304 + 2 = 666.

231221031123042 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 231221031122997 and 231221031123015.

It is not an unprimeable number, because it can be changed into a prime (231221031123041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 327961848 + ... + 328666115.

It is an arithmetic number, because the mean of its divisors is an integer number (16059478429530).

Almost surely, 2^{231221031123042} is an apocalyptic number.

231221031123042 is an abundant number, since it is smaller than the sum of its proper divisors (282682278621918).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231221031123042 is a wasteful number, since it uses less digits than its factorization.

231221031123042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 656634495 (or 656634489 counting only the distinct ones).

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

Adding to 231221031123042 its reverse (240321130122132), we get a palindrome (471542161245174).

The spelling of 231221031123042 in words is "two hundred thirty-one trillion, two hundred twenty-one billion, thirty-one million, one hundred twenty-three thousand, forty-two".