31044020221 has 8 divisors (see below), whose sum is σ = 31374012600. Its totient is φ = 30715650048.

The previous prime is 31044020197. The next prime is 31044020239. The reversal of 31044020221 is 12202044013.

It can be written as a sum of positive squares in 4 ways, for example, as 13085072100 + 17958948121 = 114390^2 + 134011^2 .

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 31044020221 - 2⁹ = 31044019709 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 (31044020521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 367056 + ... + 443641.

It is an arithmetic number, because the mean of its divisors is an integer number (3921751575).

Almost surely, 2^31044020221 is an apocalyptic number.

It is an amenable number.

31044020221 is a deficient number, since it is larger than the sum of its proper divisors (329992379).

31044020221 is a wasteful number, since it uses less digits than its factorization.

31044020221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 811103.

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 31044020221 its reverse (12202044013), we get a palindrome (43246064234).

The spelling of 31044020221 in words is "thirty-one billion, forty-four million, twenty thousand, two hundred twenty-one".