31212331321 has 8 divisors (see below), whose sum is σ = 31317698304. Its totient is φ = 31107008400.

The previous prime is 31212331303. The next prime is 31212331333. The reversal of 31212331321 is 12313321213.

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 31212331321 - 2²³ = 31203942713 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31212331292 and 31212331301.

It is not an unprimeable number, because it can be changed into a prime (31212331361) 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, 2037336 + ... + 2052598.

It is an arithmetic number, because the mean of its divisors is an integer number (3914712288).

Almost surely, 2^31212331321 is an apocalyptic number.

It is an amenable number.

31212331321 is a deficient number, since it is larger than the sum of its proper divisors (105366983).

31212331321 is a wasteful number, since it uses less digits than its factorization.

31212331321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22031.

The product of its digits is 648, while the sum is 22.

Adding to 31212331321 its reverse (12313321213), we get a palindrome (43525652534).

The spelling of 31212331321 in words is "thirty-one billion, two hundred twelve million, three hundred thirty-one thousand, three hundred twenty-one".