231211201440 has 96 divisors (see below), whose sum is σ = 728381687040. Its totient is φ = 61650699264.

The previous prime is 231211201433. The next prime is 231211201483. The reversal of 231211201440 is 44102112132.

231211201440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (96).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10201641 + ... + 10224279.

It is an arithmetic number, because the mean of its divisors is an integer number (7587309240).

Almost surely, 2^231211201440 is an apocalyptic number.

231211201440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231211201440 is an abundant number, since it is smaller than the sum of its proper divisors (497170485600).

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

231211201440 is a wasteful number, since it uses less digits than its factorization.

231211201440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43934 (or 43926 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 231211201440 its reverse (44102112132), we get a palindrome (275313313572).

The spelling of 231211201440 in words is "two hundred thirty-one billion, two hundred eleven million, two hundred one thousand, four hundred forty".