231421344525 has 36 divisors (see below), whose sum is σ = 473715822112. Its totient is φ = 105792613920.

The previous prime is 231421344523. The next prime is 231421344587. The reversal of 231421344525 is 525443124132.

It is a happy number.

231421344525 is a `hidden beast` number, since 2 + 31 + 42 + 134 + 452 + 5 = 666.

It is not a de Polignac number, because 231421344525 - 2¹ = 231421344523 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 231421344525.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231421344523) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 73465519 + ... + 73468668.

Almost surely, 2^231421344525 is an apocalyptic number.

231421344525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

231421344525 is an abundant number, since it is smaller than the sum of its proper divisors (242294477587).

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

231421344525 is a wasteful number, since it uses less digits than its factorization.

231421344525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146934210 (or 146934202 counting only the distinct ones).

The product of its digits is 115200, while the sum is 36.

Adding to 231421344525 its reverse (525443124132), we get a palindrome (756864468657).

The spelling of 231421344525 in words is "two hundred thirty-one billion, four hundred twenty-one million, three hundred forty-four thousand, five hundred twenty-five".