31340221 has 8 divisors (see below), whose sum is σ = 35113824. Its totient is φ = 27720720.

The previous prime is 31340209. The next prime is 31340227. The reversal of 31340221 is 12204313.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31340221 - 2⁷ = 31340093 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31340195 and 31340204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31340227) 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 7 ways as a sum of consecutive naturals, for example, 38095 + ... + 38908.

It is an arithmetic number, because the mean of its divisors is an integer number (4389228).

Almost surely, 2^31340221 is an apocalyptic number.

It is an amenable number.

31340221 is a deficient number, since it is larger than the sum of its proper divisors (3773603).

31340221 is a wasteful number, since it uses less digits than its factorization.

31340221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77051.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 31340221 is about 5598.2337393146. The cubic root of 31340221 is about 315.2830947930.

Adding to 31340221 its reverse (12204313), we get a palindrome (43544534).

The spelling of 31340221 in words is "thirty-one million, three hundred forty thousand, two hundred twenty-one".