312211212505 has 8 divisors (see below), whose sum is σ = 374686264512. Its totient is φ = 249747097008.

The previous prime is 312211212503. The next prime is 312211212517. The reversal of 312211212505 is 505212112213.

It is a happy number.

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 312211212505 - 2¹ = 312211212503 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 312211212505.

It is not an unprimeable number, because it can be changed into a prime (312211212503) 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, 2671189 + ... + 2785618.

It is an arithmetic number, because the mean of its divisors is an integer number (46835783064).

Almost surely, 2^312211212505 is an apocalyptic number.

It is an amenable number.

312211212505 is a deficient number, since it is larger than the sum of its proper divisors (62475052007).

312211212505 is a wasteful number, since it uses less digits than its factorization.

312211212505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5468255.

The product of its (nonzero) digits is 1200, while the sum is 25.

Adding to 312211212505 its reverse (505212112213), we get a palindrome (817423324718).

The spelling of 312211212505 in words is "three hundred twelve billion, two hundred eleven million, two hundred twelve thousand, five hundred five".