231241133420 has 96 divisors (see below), whose sum is σ = 533434144320. Its totient is φ = 83504906240.

The previous prime is 231241133399. The next prime is 231241133491. The reversal of 231241133420 is 24331142132.

It is a self number, because there is not a number n which added to its sum of digits gives 231241133420.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24655772 + ... + 24665148.

It is an arithmetic number, because the mean of its divisors is an integer number (5556605670).

Almost surely, 2^231241133420 is an apocalyptic number.

231241133420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231241133420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (266717072160).

231241133420 is an abundant number, since it is smaller than the sum of its proper divisors (302193010900).

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

231241133420 is a wasteful number, since it uses less digits than its factorization.

231241133420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10163 (or 10161 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 26.

Adding to 231241133420 its reverse (24331142132), we get a palindrome (255572275552).

The spelling of 231241133420 in words is "two hundred thirty-one billion, two hundred forty-one million, one hundred thirty-three thousand, four hundred twenty".