221041213 has 4 divisors (see below), whose sum is σ = 221239168. Its totient is φ = 220843260.

The previous prime is 221041207. The next prime is 221041229. The reversal of 221041213 is 312140122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 221041213 - 2²⁵ = 187486781 is a prime.

It is a super-2 number, since 2×221041213² = 97718435689022738, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221041813) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 97293 + ... + 99538.

It is an arithmetic number, because the mean of its divisors is an integer number (55309792).

Almost surely, 2^221041213 is an apocalyptic number.

It is an amenable number.

221041213 is a deficient number, since it is larger than the sum of its proper divisors (197955).

221041213 is a wasteful number, since it uses less digits than its factorization.

221041213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197954.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 221041213 is about 14867.4548258940. The cubic root of 221041213 is about 604.6319396897.

Adding to 221041213 its reverse (312140122), we get a palindrome (533181335).

The spelling of 221041213 in words is "two hundred twenty-one million, forty-one thousand, two hundred thirteen".