31271421 has 8 divisors (see below), whose sum is σ = 43508160. Its totient is φ = 19941152.

The previous prime is 31271419. The next prime is 31271441. The reversal of 31271421 is 12417213.

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 31271421 - 2¹ = 31271419 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31271441) 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, 226536 + ... + 226673.

It is an arithmetic number, because the mean of its divisors is an integer number (5438520).

Almost surely, 2^31271421 is an apocalyptic number.

It is an amenable number.

31271421 is a deficient number, since it is larger than the sum of its proper divisors (12236739).

31271421 is a wasteful number, since it uses less digits than its factorization.

31271421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 453235.

The product of its digits is 336, while the sum is 21.

The square root of 31271421 is about 5592.0855680149. The cubic root of 31271421 is about 315.0522160857.

Adding to 31271421 its reverse (12417213), we get a palindrome (43688634).

The spelling of 31271421 in words is "thirty-one million, two hundred seventy-one thousand, four hundred twenty-one".