31220110042440 has 256 divisors, whose sum is σ = 109554633216000. Its totient is φ = 7033136148480.

The previous prime is 31220110042409. The next prime is 31220110042453. The reversal of 31220110042440 is 4424001102213.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 31220110042440.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 7032750 + ... + 10578269.

It is an arithmetic number, because the mean of its divisors is an integer number (427947786000).

Almost surely, 2^{31220110042440} is an apocalyptic number.

31220110042440 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31220110042440 is an abundant number, since it is smaller than the sum of its proper divisors (78334523173560).

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

31220110042440 is a wasteful number, since it uses less digits than its factorization.

31220110042440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17611140 (or 17611136 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 31220110042440 its reverse (4424001102213), we get a palindrome (35644111144653).

The spelling of 31220110042440 in words is "thirty-one trillion, two hundred twenty billion, one hundred ten million, forty-two thousand, four hundred forty".