213000232221 has 24 divisors (see below), whose sum is σ = 361122662784. Its totient is φ = 118424838240.

The previous prime is 213000232219. The next prime is 213000232303. The reversal of 213000232221 is 122232000312.

213000232221 is a `hidden beast` number, since 21 + 300 + 0 + 2 + 322 + 21 = 666.

It is not a de Polignac number, because 213000232221 - 2¹ = 213000232219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 213000232194 and 213000232203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213000232321) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 45686265 + ... + 45690926.

It is an arithmetic number, because the mean of its divisors is an integer number (15046777616).

Almost surely, 2^213000232221 is an apocalyptic number.

213000232221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

213000232221 is a deficient number, since it is larger than the sum of its proper divisors (148122430563).

213000232221 is a wasteful number, since it uses less digits than its factorization.

213000232221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91377241 (or 91377238 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 213000232221 its reverse (122232000312), we get a palindrome (335232232533).

The spelling of 213000232221 in words is "two hundred thirteen billion, two hundred thirty-two thousand, two hundred twenty-one".