231011211440 has 40 divisors (see below), whose sum is σ = 545906013648. Its totient is φ = 90889655040.

The previous prime is 231011211437. The next prime is 231011211461. The reversal of 231011211440 is 44112110132.

231011211440 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 (40).

It is a Harshad number since it is a multiple of its sum of digits (20).

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 7 ways as a sum of consecutive naturals, for example, 23664302 + ... + 23674061.

Almost surely, 2^231011211440 is an apocalyptic number.

231011211440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231011211440 is an abundant number, since it is smaller than the sum of its proper divisors (314894802208).

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

231011211440 is a wasteful number, since it uses less digits than its factorization.

231011211440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47338437 (or 47338431 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 231011211440 its reverse (44112110132), we get a palindrome (275123321572).

The spelling of 231011211440 in words is "two hundred thirty-one billion, eleven million, two hundred eleven thousand, four hundred forty".