221112421 has 4 divisors (see below), whose sum is σ = 234119052. Its totient is φ = 208105792.

The previous prime is 221112413. The next prime is 221112427. The reversal of 221112421 is 124211122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 200081025 + 21031396 = 14145^2 + 4586^2 .

It is a cyclic number.

It is not a de Polignac number, because 221112421 - 2³ = 221112413 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221112395 and 221112404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221112427) 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, 6503290 + ... + 6503323.

It is an arithmetic number, because the mean of its divisors is an integer number (58529763).

Almost surely, 2^221112421 is an apocalyptic number.

It is an amenable number.

221112421 is a deficient number, since it is larger than the sum of its proper divisors (13006631).

221112421 is a wasteful number, since it uses less digits than its factorization.

221112421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13006630.

The product of its digits is 64, while the sum is 16.

The square root of 221112421 is about 14869.8493939919. The cubic root of 221112421 is about 604.6968597229.

Adding to 221112421 its reverse (124211122), we get a palindrome (345323543).

The spelling of 221112421 in words is "two hundred twenty-one million, one hundred twelve thousand, four hundred twenty-one".