31131221321032 has 48 divisors (see below), whose sum is σ = 70853223346560. Its totient is φ = 12761867121696.

The previous prime is 31131221321029. The next prime is 31131221321093. The reversal of 31131221321032 is 23012312213113.

It is a junction number, because it is equal to n+sod(n) for n = 31131221320988 and 31131221321006.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 1726434048 + ... + 1726452079.

It is an arithmetic number, because the mean of its divisors is an integer number (1476108819720).

Almost surely, 2^{31131221321032} is an apocalyptic number.

It is an amenable number.

31131221321032 is an abundant number, since it is smaller than the sum of its proper divisors (39722002025528).

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

31131221321032 is a wasteful number, since it uses less digits than its factorization.

31131221321032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3452886170 (or 3452886159 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 25.

Adding to 31131221321032 its reverse (23012312213113), we get a palindrome (54143533534145).

The spelling of 31131221321032 in words is "thirty-one trillion, one hundred thirty-one billion, two hundred twenty-one million, three hundred twenty-one thousand, thirty-two".