213113211221 has 8 divisors (see below), whose sum is σ = 218863451520. Its totient is φ = 207413634208.

The previous prime is 213113211211. The next prime is 213113211251. The reversal of 213113211221 is 122112311312.

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 213113211221 - 2¹⁴ = 213113194837 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 213113211193 and 213113211202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213113211211) 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, 12657296 + ... + 12674121.

It is an arithmetic number, because the mean of its divisors is an integer number (27357931440).

Almost surely, 2^213113211221 is an apocalyptic number.

It is an amenable number.

213113211221 is a deficient number, since it is larger than the sum of its proper divisors (5750240299).

213113211221 is a wasteful number, since it uses less digits than its factorization.

213113211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25331643.

The product of its digits is 144, while the sum is 20.

Adding to 213113211221 its reverse (122112311312), we get a palindrome (335225522533).

The spelling of 213113211221 in words is "two hundred thirteen billion, one hundred thirteen million, two hundred eleven thousand, two hundred twenty-one".