31553221024 has 48 divisors (see below), whose sum is σ = 67000689000. Its totient is φ = 14540866560.

The previous prime is 31553221001. The next prime is 31553221027. The reversal of 31553221024 is 42012235513.

It can be written as a sum of positive squares in 4 ways, for example, as 22539617424 + 9013603600 = 150132^2 + 94940^2 .

It is a junction number, because it is equal to n+sod(n) for n = 31553220983 and 31553221001.

It is not an unprimeable number, because it can be changed into a prime (31553221027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 217602 + ... + 332350.

Almost surely, 2^31553221024 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31553221024, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33500344500).

31553221024 is an abundant number, since it is smaller than the sum of its proper divisors (35447467976).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31553221024 is a wasteful number, since it uses less digits than its factorization.

31553221024 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115433 (or 115425 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 28.

Adding to 31553221024 its reverse (42012235513), we get a palindrome (73565456537).

The spelling of 31553221024 in words is "thirty-one billion, five hundred fifty-three million, two hundred twenty-one thousand, twenty-four".