213021133221 has 16 divisors (see below), whose sum is σ = 310184622720. Its totient is φ = 129243589440.

The previous prime is 213021133219. The next prime is 213021133243. The reversal of 213021133221 is 122331120312.

It is not a de Polignac number, because 213021133221 - 2¹ = 213021133219 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213021133201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38462586 + ... + 38468123.

It is an arithmetic number, because the mean of its divisors is an integer number (19386538920).

Almost surely, 2^213021133221 is an apocalyptic number.

It is an amenable number.

213021133221 is a deficient number, since it is larger than the sum of its proper divisors (97163489499).

213021133221 is a wasteful number, since it uses less digits than its factorization.

213021133221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76930796.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 213021133221 its reverse (122331120312), we get a palindrome (335352253533).

The spelling of 213021133221 in words is "two hundred thirteen billion, twenty-one million, one hundred thirty-three thousand, two hundred twenty-one".