221241403 has 2 divisors, whose sum is σ = 221241404. Its totient is φ = 221241402.

The previous prime is 221241401. The next prime is 221241479. The reversal of 221241403 is 304142122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221241403 - 2¹ = 221241401 is a prime.

Together with 221241401, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (221241401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110620701 + 110620702.

It is an arithmetic number, because the mean of its divisors is an integer number (110620702).

Almost surely, 2^221241403 is an apocalyptic number.

221241403 is a deficient number, since it is larger than the sum of its proper divisors (1).

221241403 is an equidigital number, since it uses as much as digits as its factorization.

221241403 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 221241403 is about 14874.1857928426. The cubic root of 221241403 is about 604.8144165887.

Adding to 221241403 its reverse (304142122), we get a palindrome (525383525).

The spelling of 221241403 in words is "two hundred twenty-one million, two hundred forty-one thousand, four hundred three".