31424243221 has 16 divisors (see below), whose sum is σ = 36509315328. Its totient is φ = 26491680000.

The previous prime is 31424243219. The next prime is 31424243231. The reversal of 31424243221 is 12234242413.

It is a cyclic number.

It is not a de Polignac number, because 31424243221 - 2¹ = 31424243219 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 31424243221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31424243231) 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 15 ways as a sum of consecutive naturals, for example, 40420 + ... + 253933.

It is an arithmetic number, because the mean of its divisors is an integer number (2281832208).

Almost surely, 2^31424243221 is an apocalyptic number.

It is an amenable number.

31424243221 is a deficient number, since it is larger than the sum of its proper divisors (5085072107).

31424243221 is a wasteful number, since it uses less digits than its factorization.

31424243221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 294612.

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

Adding to 31424243221 its reverse (12234242413), we get a palindrome (43658485634).

The spelling of 31424243221 in words is "thirty-one billion, four hundred twenty-four million, two hundred forty-three thousand, two hundred twenty-one".