213146221 has 8 divisors (see below), whose sum is σ = 235497024. Its totient is φ = 191885760.

The previous prime is 213146179. The next prime is 213146239. The reversal of 213146221 is 122641312.

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 213146221 - 2⁷ = 213146093 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 213146192 and 213146201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213146281) 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, 272175 + ... + 272956.

It is an arithmetic number, because the mean of its divisors is an integer number (29437128).

Almost surely, 2^213146221 is an apocalyptic number.

It is an amenable number.

213146221 is a deficient number, since it is larger than the sum of its proper divisors (22350803).

213146221 is a wasteful number, since it uses less digits than its factorization.

213146221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 545171.

The product of its digits is 576, while the sum is 22.

The square root of 213146221 is about 14599.5281088123. The cubic root of 213146221 is about 597.3458888384.

Adding to 213146221 its reverse (122641312), we get a palindrome (335787533).

The spelling of 213146221 in words is "two hundred thirteen million, one hundred forty-six thousand, two hundred twenty-one".