221243371 has 8 divisors (see below), whose sum is σ = 233786880. Its totient is φ = 208943592.

The previous prime is 221243369. The next prime is 221243377. The reversal of 221243371 is 173342122.

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 221243371 - 2¹ = 221243369 is a prime.

It is a super-2 number, since 2×221243371² = 97897258422887282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221243377) 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, 59065 + ... + 62698.

It is an arithmetic number, because the mean of its divisors is an integer number (29223360).

Almost surely, 2^221243371 is an apocalyptic number.

221243371 is a deficient number, since it is larger than the sum of its proper divisors (12543509).

221243371 is a wasteful number, since it uses less digits than its factorization.

221243371 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121865.

The product of its digits is 2016, while the sum is 25.

The square root of 221243371 is about 14874.2519475771. The cubic root of 221243371 is about 604.8162099107.

Adding to 221243371 its reverse (173342122), we get a palindrome (394585493).

The spelling of 221243371 in words is "two hundred twenty-one million, two hundred forty-three thousand, three hundred seventy-one".