213121204222312 has 16 divisors (see below), whose sum is σ = 399611563971840. Its totient is φ = 106558120496496.

The previous prime is 213121204222217. The next prime is 213121204222369. The reversal of 213121204222312 is 213222402121312.

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, 309836818 + ... + 310523905.

It is an arithmetic number, because the mean of its divisors is an integer number (24975722748240).

Almost surely, 2^{213121204222312} is an apocalyptic number.

It is an amenable number.

213121204222312 is a deficient number, since it is larger than the sum of its proper divisors (186490359749528).

213121204222312 is a wasteful number, since it uses less digits than its factorization.

213121204222312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 620403672 (or 620403668 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 28.

Adding to 213121204222312 its reverse (213222402121312), we get a palindrome (426343606343624).

The spelling of 213121204222312 in words is "two hundred thirteen trillion, one hundred twenty-one billion, two hundred four million, two hundred twenty-two thousand, three hundred twelve".