221421044 has 24 divisors (see below), whose sum is σ = 420352968. Its totient is φ = 101445120.

The previous prime is 221421043. The next prime is 221421049. The reversal of 221421044 is 440124122.

221421044 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 4153444 + 217267600 = 2038^2 + 14740^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221421043) 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, 8417 + ... + 22664.

It is an arithmetic number, because the mean of its divisors is an integer number (17514707).

Almost surely, 2^221421044 is an apocalyptic number.

It is an amenable number.

221421044 is a deficient number, since it is larger than the sum of its proper divisors (198931924).

221421044 is a wasteful number, since it uses less digits than its factorization.

221421044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31235 (or 31233 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 221421044 is about 14880.2232510134. The cubic root of 221421044 is about 604.9780690090.

Adding to 221421044 its reverse (440124122), we get a palindrome (661545166).

The spelling of 221421044 in words is "two hundred twenty-one million, four hundred twenty-one thousand, forty-four".