31444351421 has 4 divisors (see below), whose sum is σ = 35936401632. Its totient is φ = 26952301212.

The previous prime is 31444351369. The next prime is 31444351429. The reversal of 31444351421 is 12415344413.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12415344413 = 37 ⋅335549849.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31444351421 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 (31444351429) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2246025095 + ... + 2246025108.

It is an arithmetic number, because the mean of its divisors is an integer number (8984100408).

Almost surely, 2^31444351421 is an apocalyptic number.

It is an amenable number.

31444351421 is a deficient number, since it is larger than the sum of its proper divisors (4492050211).

31444351421 is an equidigital number, since it uses as much as digits as its factorization.

31444351421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4492050210.

The product of its digits is 23040, while the sum is 32.

Adding to 31444351421 its reverse (12415344413), we get a palindrome (43859695834).

The spelling of 31444351421 in words is "thirty-one billion, four hundred forty-four million, three hundred fifty-one thousand, four hundred twenty-one".