1231100042440 has 64 divisors (see below), whose sum is σ = 2845059312960. Its totient is φ = 479093771520.

The previous prime is 1231100042413. The next prime is 1231100042453. The reversal of 1231100042440 is 442400011321.

It is a happy 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, 26502835 + ... + 26549245.

It is an arithmetic number, because the mean of its divisors is an integer number (44454051765).

Almost surely, 2^{1231100042440} is an apocalyptic number.

1231100042440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1231100042440 is an abundant number, since it is smaller than the sum of its proper divisors (1613959270520).

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

1231100042440 is a wasteful number, since it uses less digits than its factorization.

1231100042440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64382 (or 64378 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 1231100042440 its reverse (442400011321), we get a palindrome (1673500053761).

The spelling of 1231100042440 in words is "one trillion, two hundred thirty-one billion, one hundred million, forty-two thousand, four hundred forty".