31132240221 has 16 divisors (see below), whose sum is σ = 43698237440. Its totient is φ = 19660728240.

The previous prime is 31132240219. The next prime is 31132240229. The reversal of 31132240221 is 12204223113.

It is not a de Polignac number, because 31132240221 - 2¹ = 31132240219 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 (31132240229) 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 15 ways as a sum of consecutive naturals, for example, 1013316 + ... + 1043586.

It is an arithmetic number, because the mean of its divisors is an integer number (2731139840).

Almost surely, 2^31132240221 is an apocalyptic number.

It is an amenable number.

31132240221 is a deficient number, since it is larger than the sum of its proper divisors (12565997219).

31132240221 is a wasteful number, since it uses less digits than its factorization.

31132240221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48336.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 31132240221 its reverse (12204223113), we get a palindrome (43336463334).

The spelling of 31132240221 in words is "thirty-one billion, one hundred thirty-two million, two hundred forty thousand, two hundred twenty-one".