31133021232 has 80 divisors (see below), whose sum is σ = 81308094560. Its totient is φ = 10264320000.

The previous prime is 31133021189. The next prime is 31133021233. The reversal of 31133021232 is 23212033113.

It is a super-2 number, since 2×31133021232² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31133021199 and 31133021208.

It is not an unprimeable number, because it can be changed into a prime (31133021233) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3139482 + ... + 3149382.

It is an arithmetic number, because the mean of its divisors is an integer number (1016351182).

Almost surely, 2^31133021232 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 31133021232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40654047280).

31133021232 is an abundant number, since it is smaller than the sum of its proper divisors (50175073328).

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

31133021232 is a wasteful number, since it uses less digits than its factorization.

31133021232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10622 (or 10616 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 31133021232 its reverse (23212033113), we get a palindrome (54345054345).

The spelling of 31133021232 in words is "thirty-one billion, one hundred thirty-three million, twenty-one thousand, two hundred thirty-two".