31444234021 has 4 divisors (see below), whose sum is σ = 31977187200. Its totient is φ = 30911280844.

The previous prime is 31444234009. The next prime is 31444234033. The reversal of 31444234021 is 12043244413.

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: 12043244413 = 647 ⋅18613979.

It is an interprime number because it is at equal distance from previous prime (31444234009) and next prime (31444234033).

It is a cyclic number.

It is not a de Polignac number, because 31444234021 - 2⁷ = 31444233893 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 (31444234321) 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, 266476501 + ... + 266476618.

It is an arithmetic number, because the mean of its divisors is an integer number (7994296800).

Almost surely, 2^31444234021 is an apocalyptic number.

It is an amenable number.

31444234021 is a deficient number, since it is larger than the sum of its proper divisors (532953179).

31444234021 is an equidigital number, since it uses as much as digits as its factorization.

31444234021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 532953178.

The product of its (nonzero) digits is 9216, while the sum is 28.

Adding to 31444234021 its reverse (12043244413), we get a palindrome (43487478434).

The spelling of 31444234021 in words is "thirty-one billion, four hundred forty-four million, two hundred thirty-four thousand, twenty-one".