31444021 has 4 divisors (see below), whose sum is σ = 35936032. Its totient is φ = 26952012.

The previous prime is 31444019. The next prime is 31444079. The reversal of 31444021 is 12044413.

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 31444021 - 2¹ = 31444019 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 31444021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31444001) 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, 2245995 + ... + 2246008.

It is an arithmetic number, because the mean of its divisors is an integer number (8984008).

Almost surely, 2^31444021 is an apocalyptic number.

It is an amenable number.

31444021 is a deficient number, since it is larger than the sum of its proper divisors (4492011).

31444021 is an equidigital number, since it uses as much as digits as its factorization.

31444021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4492010.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 31444021 is about 5607.4968568872. The cubic root of 31444021 is about 315.6307877382.

Adding to 31444021 its reverse (12044413), we get a palindrome (43488434).

The spelling of 31444021 in words is "thirty-one million, four hundred forty-four thousand, twenty-one".