31221030044 has 12 divisors (see below), whose sum is σ = 54638039568. Its totient is φ = 15610161600.

The previous prime is 31221030023. The next prime is 31221030073. The reversal of 31221030044 is 44003012213.

It is a junction number, because it is equal to n+sod(n) for n = 31221029998 and 31221030025.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 303689 + ... + 393279.

It is an arithmetic number, because the mean of its divisors is an integer number (4553169964).

Almost surely, 2^31221030044 is an apocalyptic number.

It is an amenable number.

31221030044 is a deficient number, since it is larger than the sum of its proper divisors (23417009524).

31221030044 is a wasteful number, since it uses less digits than its factorization.

31221030044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176716 (or 176714 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 31221030044 its reverse (44003012213), we get a palindrome (75224042257).

The spelling of 31221030044 in words is "thirty-one billion, two hundred twenty-one million, thirty thousand, forty-four".