231552421132220 has 48 divisors (see below), whose sum is σ = 487060524897408. Its totient is φ = 92468508065280.

The previous prime is 231552421132183. The next prime is 231552421132223. The reversal of 231552421132220 is 22231124255132.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231552421132223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1417554392 + ... + 1417717728.

It is an arithmetic number, because the mean of its divisors is an integer number (10147094268696).

Almost surely, 2^{231552421132220} is an apocalyptic number.

231552421132220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231552421132220 is an abundant number, since it is smaller than the sum of its proper divisors (255508103765188).

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

231552421132220 is a wasteful number, since it uses less digits than its factorization.

231552421132220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279590 (or 279588 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 35.

Adding to 231552421132220 its reverse (22231124255132), we get a palindrome (253783545387352).

The spelling of 231552421132220 in words is "two hundred thirty-one trillion, five hundred fifty-two billion, four hundred twenty-one million, one hundred thirty-two thousand, two hundred twenty".