31211323213 has 8 divisors (see below), whose sum is σ = 37768324032. Its totient is φ = 25178882496.

The previous prime is 31211323177. The next prime is 31211323259. The reversal of 31211323213 is 31232311213.

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 31211323213 - 2²⁹ = 30674452301 is a prime.

It is a super-3 number, since 3×31211323213³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31211326213) 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, 131139895 + ... + 131140132.

It is an arithmetic number, because the mean of its divisors is an integer number (4721040504).

Almost surely, 2^31211323213 is an apocalyptic number.

It is an amenable number.

31211323213 is a deficient number, since it is larger than the sum of its proper divisors (6557000819).

31211323213 is a wasteful number, since it uses less digits than its factorization.

31211323213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262280051.

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

Adding to 31211323213 its reverse (31232311213), we get a palindrome (62443634426).

The spelling of 31211323213 in words is "thirty-one billion, two hundred eleven million, three hundred twenty-three thousand, two hundred thirteen".