213313221 has 24 divisors (see below), whose sum is σ = 336591840. Its totient is φ = 129103200.

The previous prime is 213313211. The next prime is 213313223. The reversal of 213313221 is 122313312.

It is not a de Polignac number, because 213313221 - 2¹¹ = 213311173 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 213313194 and 213313203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213313223) 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, 126975 + ... + 128643.

It is an arithmetic number, because the mean of its divisors is an integer number (14024660).

Almost surely, 2^213313221 is an apocalyptic number.

It is an amenable number.

213313221 is a deficient number, since it is larger than the sum of its proper divisors (123278619).

213313221 is a wasteful number, since it uses less digits than its factorization.

213313221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2977 (or 2974 counting only the distinct ones).

The product of its digits is 216, while the sum is 18.

The square root of 213313221 is about 14605.2463519107. The cubic root of 213313221 is about 597.5018548871.

Adding to 213313221 its reverse (122313312), we get a palindrome (335626533).

Subtracting from 213313221 its reverse (122313312), we obtain a palindrome (90999909).

The spelling of 213313221 in words is "two hundred thirteen million, three hundred thirteen thousand, two hundred twenty-one".