231021402012 has 144 divisors (see below), whose sum is σ = 635907111840. Its totient is φ = 70421446656.

The previous prime is 231021402011. The next prime is 231021402041. The reversal of 231021402012 is 210204120132.

It is a happy number.

231021402012 is a `hidden beast` number, since 231 + 0 + 21 + 402 + 0 + 12 = 666.

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 (231021402011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 17406603 + ... + 17419869.

It is an arithmetic number, because the mean of its divisors is an integer number (4416021610).

Almost surely, 2^231021402012 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231021402012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (317953555920).

231021402012 is an abundant number, since it is smaller than the sum of its proper divisors (404885709828).

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

231021402012 is a wasteful number, since it uses less digits than its factorization.

231021402012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14100 (or 14095 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 231021402012 its reverse (210204120132), we get a palindrome (441225522144).

The spelling of 231021402012 in words is "two hundred thirty-one billion, twenty-one million, four hundred two thousand, twelve".