221040403 has 2 divisors, whose sum is σ = 221040404. Its totient is φ = 221040402.

The previous prime is 221040401. The next prime is 221040427. The reversal of 221040403 is 304040122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221040403 - 2¹ = 221040401 is a prime.

Together with 221040401, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (221040401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110520201 + 110520202.

It is an arithmetic number, because the mean of its divisors is an integer number (110520202).

Almost surely, 2^221040403 is an apocalyptic number.

221040403 is a deficient number, since it is larger than the sum of its proper divisors (1).

221040403 is an equidigital number, since it uses as much as digits as its factorization.

221040403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 221040403 is about 14867.4275851608. The cubic root of 221040403 is about 604.6312011359.

Adding to 221040403 its reverse (304040122), we get a palindrome (525080525).

The spelling of 221040403 in words is "two hundred twenty-one million, forty thousand, four hundred three".