221321103 has 4 divisors (see below), whose sum is σ = 295094808. Its totient is φ = 147547400.

The previous prime is 221321053. The next prime is 221321119. The reversal of 221321103 is 301123122.

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

It is a cyclic number.

It is not a de Polignac number, because 221321103 - 2¹⁰ = 221320079 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221321003) 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, 36886848 + ... + 36886853.

It is an arithmetic number, because the mean of its divisors is an integer number (73773702).

Almost surely, 2^221321103 is an apocalyptic number.

221321103 is a deficient number, since it is larger than the sum of its proper divisors (73773705).

221321103 is an equidigital number, since it uses as much as digits as its factorization.

221321103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73773704.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 221321103 is about 14876.8646898464. The cubic root of 221321103 is about 604.8870339819.

Adding to 221321103 its reverse (301123122), we get a palindrome (522444225).

It can be divided in two parts, 22 and 1321103, that added together give a triangular number (1321125 = T₁₆₂₅).

The spelling of 221321103 in words is "two hundred twenty-one million, three hundred twenty-one thousand, one hundred three".