221142403 has 2 divisors, whose sum is σ = 221142404. Its totient is φ = 221142402.

The previous prime is 221142359. The next prime is 221142413. The reversal of 221142403 is 304241122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221142403 - 2⁹ = 221141891 is a prime.

It is a super-2 number, since 2×221142403² = 97807924809228818, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (221142413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110571201 + 110571202.

It is an arithmetic number, because the mean of its divisors is an integer number (110571202).

Almost surely, 2^221142403 is an apocalyptic number.

221142403 is a deficient number, since it is larger than the sum of its proper divisors (1).

221142403 is an equidigital number, since it uses as much as digits as its factorization.

221142403 is an odious number, because the sum of its binary digits is odd.

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

The square root of 221142403 is about 14870.8575072186. The cubic root of 221142403 is about 604.7241900160.

Adding to 221142403 its reverse (304241122), we get a palindrome (525383525).

The spelling of 221142403 in words is "two hundred twenty-one million, one hundred forty-two thousand, four hundred three".