221421311 has 8 divisors (see below), whose sum is σ = 235431360. Its totient is φ = 207520768.

The previous prime is 221421289. The next prime is 221421331. The reversal of 221421311 is 113124122.

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

It is not a de Polignac number, because 221421311 - 2¹⁴ = 221404927 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221421311.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221421331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23186 + ... + 31311.

It is an arithmetic number, because the mean of its divisors is an integer number (29428920).

Almost surely, 2^221421311 is an apocalyptic number.

221421311 is a deficient number, since it is larger than the sum of its proper divisors (14010049).

221421311 is a wasteful number, since it uses less digits than its factorization.

221421311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54753.

The product of its digits is 96, while the sum is 17.

The square root of 221421311 is about 14880.2322226503. The cubic root of 221421311 is about 604.9783121793.

Adding to 221421311 its reverse (113124122), we get a palindrome (334545433).

The spelling of 221421311 in words is "two hundred twenty-one million, four hundred twenty-one thousand, three hundred eleven".