221216003 has 2 divisors, whose sum is σ = 221216004. Its totient is φ = 221216002.

The previous prime is 221215991. The next prime is 221216027. The reversal of 221216003 is 300612122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221216003 - 2¹⁰ = 221214979 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (221216063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110608001 + 110608002.

It is an arithmetic number, because the mean of its divisors is an integer number (110608002).

Almost surely, 2^221216003 is an apocalyptic number.

221216003 is a deficient number, since it is larger than the sum of its proper divisors (1).

221216003 is an equidigital number, since it uses as much as digits as its factorization.

221216003 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 221216003 is about 14873.3319400866. The cubic root of 221216003 is about 604.7912701162.

Adding to 221216003 its reverse (300612122), we get a palindrome (521828125).

The spelling of 221216003 in words is "two hundred twenty-one million, two hundred sixteen thousand, three".