31212213423 has 8 divisors (see below), whose sum is σ = 41620556208. Its totient is φ = 20806006464.

The previous prime is 31212213421. The next prime is 31212213427. The reversal of 31212213423 is 32431221213.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 31212213423 - 2¹ = 31212213421 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31212213393 and 31212213402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31212213421) by changing a digit.

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, 499540 + ... + 558537.

It is an arithmetic number, because the mean of its divisors is an integer number (5202569526).

Almost surely, 2^31212213423 is an apocalyptic number.

31212213423 is a deficient number, since it is larger than the sum of its proper divisors (10408342785).

31212213423 is a wasteful number, since it uses less digits than its factorization.

31212213423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1067913.

The product of its digits is 1728, while the sum is 24.

Adding to 31212213423 its reverse (32431221213), we get a palindrome (63643434636).

The spelling of 31212213423 in words is "thirty-one billion, two hundred twelve million, two hundred thirteen thousand, four hundred twenty-three".