213221245 has 8 divisors (see below), whose sum is σ = 255951360. Its totient is φ = 170519760.

The previous prime is 213221243. The next prime is 213221251. The reversal of 213221245 is 542122312.

It is a happy number.

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

It is not a de Polignac number, because 213221245 - 2¹ = 213221243 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213221243) 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, 16116 + ... + 26194.

It is an arithmetic number, because the mean of its divisors is an integer number (31993920).

Almost surely, 2^213221245 is an apocalyptic number.

It is an amenable number.

213221245 is a deficient number, since it is larger than the sum of its proper divisors (42730115).

213221245 is a wasteful number, since it uses less digits than its factorization.

213221245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14315.

The product of its digits is 960, while the sum is 22.

The square root of 213221245 is about 14602.0972808703. The cubic root of 213221245 is about 597.4159659599.

Adding to 213221245 its reverse (542122312), we get a palindrome (755343557).

The spelling of 213221245 in words is "two hundred thirteen million, two hundred twenty-one thousand, two hundred forty-five".