231315215420 has 48 divisors (see below), whose sum is σ = 487747764000. Its totient is φ = 92148188160.

The previous prime is 231315215407. The next prime is 231315215449. The reversal of 231315215420 is 24512513132.

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, 11786576 + ... + 11806184.

It is an arithmetic number, because the mean of its divisors is an integer number (10161411750).

Almost surely, 2^231315215420 is an apocalyptic number.

231315215420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231315215420 is an abundant number, since it is smaller than the sum of its proper divisors (256432548580).

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

231315215420 is a wasteful number, since it uses less digits than its factorization.

231315215420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21998 (or 21996 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 29.

Adding to 231315215420 its reverse (24512513132), we get a palindrome (255827728552).

The spelling of 231315215420 in words is "two hundred thirty-one billion, three hundred fifteen million, two hundred fifteen thousand, four hundred twenty".