213111312321 has 32 divisors (see below), whose sum is σ = 307444429440. Its totient is φ = 130888203264.

The previous prime is 213111312317. The next prime is 213111312361. The reversal of 213111312321 is 123213111312.

It is not a de Polignac number, because 213111312321 - 2² = 213111312317 is a prime.

It is not an unprimeable number, because it can be changed into a prime (213111312361) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29235 + ... + 653511.

It is an arithmetic number, because the mean of its divisors is an integer number (9607638420).

Almost surely, 2^213111312321 is an apocalyptic number.

It is an amenable number.

213111312321 is a deficient number, since it is larger than the sum of its proper divisors (94333117119).

213111312321 is a wasteful number, since it uses less digits than its factorization.

213111312321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 624465.

The product of its digits is 216, while the sum is 21.

Adding to 213111312321 its reverse (123213111312), we get a palindrome (336324423633).

The spelling of 213111312321 in words is "two hundred thirteen billion, one hundred eleven million, three hundred twelve thousand, three hundred twenty-one".