213132121221 has 8 divisors (see below), whose sum is σ = 285428039904. Its totient is φ = 141462141680.

The previous prime is 213132121199. The next prime is 213132121231. The reversal of 213132121221 is 122121231312.

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 213132121221 - 2¹⁴ = 213132104837 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213132121231) 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, 156483990 + ... + 156485351.

It is an arithmetic number, because the mean of its divisors is an integer number (35678504988).

Almost surely, 2^213132121221 is an apocalyptic number.

It is an amenable number.

213132121221 is a deficient number, since it is larger than the sum of its proper divisors (72295918683).

213132121221 is a wasteful number, since it uses less digits than its factorization.

213132121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312969571.

The product of its digits is 288, while the sum is 21.

Adding to 213132121221 its reverse (122121231312), we get a palindrome (335253352533).

The spelling of 213132121221 in words is "two hundred thirteen billion, one hundred thirty-two million, one hundred twenty-one thousand, two hundred twenty-one".