213221121 has 8 divisors (see below), whose sum is σ = 291978624. Its totient is φ = 138305520.

The previous prime is 213221117. The next prime is 213221143. The reversal of 213221121 is 121122312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 213221121 - 2² = 213221117 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 213221121.

It is not an unprimeable number, because it can be changed into a prime (213221161) 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, 960345 + ... + 960566.

It is an arithmetic number, because the mean of its divisors is an integer number (36497328).

Almost surely, 2^213221121 is an apocalyptic number.

It is an amenable number.

213221121 is a deficient number, since it is larger than the sum of its proper divisors (78757503).

213221121 is a wasteful number, since it uses less digits than its factorization.

213221121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1920951.

The product of its digits is 48, while the sum is 15.

The square root of 213221121 is about 14602.0930349043. The cubic root of 213221121 is about 597.4158501497.

Adding to 213221121 its reverse (121122312), we get a palindrome (334343433).

The spelling of 213221121 in words is "two hundred thirteen million, two hundred twenty-one thousand, one hundred twenty-one".