221041421 has 8 divisors (see below), whose sum is σ = 233539200. Its totient is φ = 208630080.

The previous prime is 221041397. The next prime is 221041433. The reversal of 221041421 is 124140122.

221041421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 221041421 - 2⁶ = 221041357 is a prime.

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 221041421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221041481) 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, 16316 + ... + 26613.

It is an arithmetic number, because the mean of its divisors is an integer number (29192400).

Almost surely, 2^221041421 is an apocalyptic number.

It is an amenable number.

221041421 is a deficient number, since it is larger than the sum of its proper divisors (12497779).

221041421 is a wasteful number, since it uses less digits than its factorization.

221041421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43219.

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 221041421 is about 14867.4618210372. The cubic root of 221041421 is about 604.6321293427.

Adding to 221041421 its reverse (124140122), we get a palindrome (345181543).

The spelling of 221041421 in words is "two hundred twenty-one million, forty-one thousand, four hundred twenty-one".