231532420123220 has 48 divisors (see below), whose sum is σ = 495394461006480. Its totient is φ = 90865103686656.

The previous prime is 231532420123201. The next prime is 231532420123247. The reversal of 231532420123220 is 22321024235132.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 24098339908036 + 207434080215184 = 4909006^2 + 14402572^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 284510024 + ... + 285322656.

It is an arithmetic number, because the mean of its divisors is an integer number (10320717937635).

Almost surely, 2^{231532420123220} is an apocalyptic number.

231532420123220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231532420123220 is an abundant number, since it is smaller than the sum of its proper divisors (263862040883260).

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

231532420123220 is a wasteful number, since it uses less digits than its factorization.

231532420123220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1081484 (or 1081482 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 32.

Adding to 231532420123220 its reverse (22321024235132), we get a palindrome (253853444358352).

The spelling of 231532420123220 in words is "two hundred thirty-one trillion, five hundred thirty-two billion, four hundred twenty million, one hundred twenty-three thousand, two hundred twenty".