31442112421 has 16 divisors (see below), whose sum is σ = 32556160000. Its totient is φ = 30334487040.

The previous prime is 31442112413. The next prime is 31442112439. The reversal of 31442112421 is 12421124413.

It is not a de Polignac number, because 31442112421 - 2³ = 31442112413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31442112721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25173205 + ... + 25174453.

It is an arithmetic number, because the mean of its divisors is an integer number (2034760000).

Almost surely, 2^31442112421 is an apocalyptic number.

31442112421 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

31442112421 is a deficient number, since it is larger than the sum of its proper divisors (1114047579).

31442112421 is a wasteful number, since it uses less digits than its factorization.

31442112421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3124.

The product of its digits is 1536, while the sum is 25.

Adding to 31442112421 its reverse (12421124413), we get a palindrome (43863236834).

The spelling of 31442112421 in words is "thirty-one billion, four hundred forty-two million, one hundred twelve thousand, four hundred twenty-one".