231231021102 has 24 divisors (see below), whose sum is σ = 501058163736. Its totient is φ = 77068142736.

The previous prime is 231231021089. The next prime is 231231021103. The reversal of 231231021102 is 201120132132.

231231021102 is a `hidden beast` number, since 231 + 2 + 310 + 21 + 102 = 666.

231231021102 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 (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231231021103) 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 11 ways as a sum of consecutive naturals, for example, 576873 + ... + 891764.

It is an arithmetic number, because the mean of its divisors is an integer number (20877423489).

Almost surely, 2^231231021102 is an apocalyptic number.

231231021102 is an abundant number, since it is smaller than the sum of its proper divisors (269827142634).

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

231231021102 is a wasteful number, since it uses less digits than its factorization.

231231021102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1477392 (or 1477389 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 231231021102 its reverse (201120132132), we get a palindrome (432351153234).

The spelling of 231231021102 in words is "two hundred thirty-one billion, two hundred thirty-one million, twenty-one thousand, one hundred two".