231420320040 has 128 divisors (see below), whose sum is σ = 854475068160. Its totient is φ = 48827142144.

The previous prime is 231420320039. The next prime is 231420320069. The reversal of 231420320040 is 40023024132.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 231420319989 and 231420320016.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10585249 + ... + 10607088.

It is an arithmetic number, because the mean of its divisors is an integer number (6675586470).

Almost surely, 2^231420320040 is an apocalyptic number.

231420320040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231420320040 is an abundant number, since it is smaller than the sum of its proper divisors (623054748120).

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

231420320040 is a wasteful number, since it uses less digits than its factorization.

231420320040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21192371 (or 21192367 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 21.

Adding to 231420320040 its reverse (40023024132), we get a palindrome (271443344172).

The spelling of 231420320040 in words is "two hundred thirty-one billion, four hundred twenty million, three hundred twenty thousand, forty".