221242311 has 12 divisors (see below), whose sum is σ = 319725120. Its totient is φ = 147424320.

The previous prime is 221242291. The next prime is 221242321. The reversal of 221242311 is 113242122.

It is a happy number.

It is not a de Polignac number, because 221242311 - 2¹⁵ = 221209543 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221242321) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19951 + ... + 28991.

It is an arithmetic number, because the mean of its divisors is an integer number (26643760).

Almost surely, 2^221242311 is an apocalyptic number.

221242311 is a deficient number, since it is larger than the sum of its proper divisors (98482809).

221242311 is a wasteful number, since it uses less digits than its factorization.

221242311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11766 (or 11763 counting only the distinct ones).

The product of its digits is 192, while the sum is 18.

The square root of 221242311 is about 14874.2163154904. The cubic root of 221242311 is about 604.8152439967.

Adding to 221242311 its reverse (113242122), we get a palindrome (334484433).

The spelling of 221242311 in words is "two hundred twenty-one million, two hundred forty-two thousand, three hundred eleven".