231521555300340 has 48 divisors (see below), whose sum is σ = 648686002079808. Its totient is φ = 61698543581184.

The previous prime is 231521555300297. The next prime is 231521555300353. The reversal of 231521555300340 is 43003555125132.

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, 1266715117 + ... + 1266897876.

It is an arithmetic number, because the mean of its divisors is an integer number (13514291709996).

Almost surely, 2^{231521555300340} is an apocalyptic number.

231521555300340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231521555300340 is an abundant number, since it is smaller than the sum of its proper divisors (417164446779468).

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

231521555300340 is a wasteful number, since it uses less digits than its factorization.

231521555300340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2533614528 (or 2533614526 counting only the distinct ones).

The product of its (nonzero) digits is 270000, while the sum is 39.

The spelling of 231521555300340 in words is "two hundred thirty-one trillion, five hundred twenty-one billion, five hundred fifty-five million, three hundred thousand, three hundred forty".