31121232032 has 48 divisors (see below), whose sum is σ = 66986523072. Its totient is φ = 14114987520.

The previous prime is 31121232013. The next prime is 31121232047. The reversal of 31121232032 is 23023212113.

It is a junction number, because it is equal to n+sod(n) for n = 31121231995 and 31121232013.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64133 + ... + 257595.

It is an arithmetic number, because the mean of its divisors is an integer number (1395552564).

Almost surely, 2^31121232032 is an apocalyptic number.

31121232032 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31121232032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33493261536).

31121232032 is an abundant number, since it is smaller than the sum of its proper divisors (35865291040).

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

31121232032 is a wasteful number, since it uses less digits than its factorization.

31121232032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193941 (or 193933 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 31121232032 its reverse (23023212113), we get a palindrome (54144444145).

The spelling of 31121232032 in words is "thirty-one billion, one hundred twenty-one million, two hundred thirty-two thousand, thirty-two".