31223232421 has 8 divisors (see below), whose sum is σ = 31435606400. Its totient is φ = 31011543360.

The previous prime is 31223232407. The next prime is 31223232463. The reversal of 31223232421 is 12423232213.

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 31223232421 - 2⁹ = 31223231909 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 (31223238421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79581 + ... + 262258.

It is an arithmetic number, because the mean of its divisors is an integer number (3929450800).

Almost surely, 2^31223232421 is an apocalyptic number.

It is an amenable number.

31223232421 is a deficient number, since it is larger than the sum of its proper divisors (212373979).

31223232421 is a wasteful number, since it uses less digits than its factorization.

31223232421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342459.

The product of its digits is 3456, while the sum is 25.

Adding to 31223232421 its reverse (12423232213), we get a palindrome (43646464634).

The spelling of 31223232421 in words is "thirty-one billion, two hundred twenty-three million, two hundred thirty-two thousand, four hundred twenty-one".