31321231420 has 12 divisors (see below), whose sum is σ = 65774586024. Its totient is φ = 12528492560.

The previous prime is 31321231367. The next prime is 31321231439. The reversal of 31321231420 is 2413212313.

It is a junction number, because it is equal to n+sod(n) for n = 31321231391 and 31321231400.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 783030766 + ... + 783030805.

It is an arithmetic number, because the mean of its divisors is an integer number (5481215502).

Almost surely, 2^31321231420 is an apocalyptic number.

It is an amenable number.

31321231420 is an abundant number, since it is smaller than the sum of its proper divisors (34453354604).

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

31321231420 is a wasteful number, since it uses less digits than its factorization.

31321231420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1566061580 (or 1566061578 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 31321231420 its reverse (2413212313), we get a palindrome (33734443733).

The spelling of 31321231420 in words is "thirty-one billion, three hundred twenty-one million, two hundred thirty-one thousand, four hundred twenty".