31132013221 has 8 divisors (see below), whose sum is σ = 32145465600. Its totient is φ = 30119135520.

The previous prime is 31132013183. The next prime is 31132013233. The reversal of 31132013221 is 12231023113.

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 31132013221 - 2¹¹ = 31132011173 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 (31132013261) 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, 32176 + ... + 251593.

It is an arithmetic number, because the mean of its divisors is an integer number (4018183200).

Almost surely, 2^31132013221 is an apocalyptic number.

31132013221 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

31132013221 is a deficient number, since it is larger than the sum of its proper divisors (1013452379).

31132013221 is a wasteful number, since it uses less digits than its factorization.

31132013221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287339.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 31132013221 its reverse (12231023113), we get a palindrome (43363036334).

The spelling of 31132013221 in words is "thirty-one billion, one hundred thirty-two million, thirteen thousand, two hundred twenty-one".