31244142421 has 4 divisors (see below), whose sum is σ = 31318711200. Its totient is φ = 31169573644.

The previous prime is 31244142403. The next prime is 31244142451. The reversal of 31244142421 is 12424144213.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31244142421 - 2²⁷ = 31109924693 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31244142421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31244142451) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 37283761 + ... + 37284598.

It is an arithmetic number, because the mean of its divisors is an integer number (7829677800).

Almost surely, 2^31244142421 is an apocalyptic number.

It is an amenable number.

31244142421 is a deficient number, since it is larger than the sum of its proper divisors (74568779).

31244142421 is an equidigital number, since it uses as much as digits as its factorization.

31244142421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74568778.

The product of its digits is 6144, while the sum is 28.

Adding to 31244142421 its reverse (12424144213), we get a palindrome (43668286634).

The spelling of 31244142421 in words is "thirty-one billion, two hundred forty-four million, one hundred forty-two thousand, four hundred twenty-one".