231640121740 has 12 divisors (see below), whose sum is σ = 486444255696. Its totient is φ = 92656048688.

The previous prime is 231640121737. The next prime is 231640121851. The reversal of 231640121740 is 47121046132.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5791003024 + ... + 5791003063.

It is an arithmetic number, because the mean of its divisors is an integer number (40537021308).

Almost surely, 2^231640121740 is an apocalyptic number.

231640121740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231640121740 is an abundant number, since it is smaller than the sum of its proper divisors (254804133956).

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

231640121740 is a wasteful number, since it uses less digits than its factorization.

231640121740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11582006096 (or 11582006094 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 31.

Adding to 231640121740 its reverse (47121046132), we get a palindrome (278761167872).

The spelling of 231640121740 in words is "two hundred thirty-one billion, six hundred forty million, one hundred twenty-one thousand, seven hundred forty".