221221231403 has 4 divisors (see below), whose sum is σ = 223886547528. Its totient is φ = 218555915280.

The previous prime is 221221231393. The next prime is 221221231409. The reversal of 221221231403 is 304132122122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 304132122122 = 2 ⋅152066061061.

It is a cyclic number.

It is not a de Polignac number, because 221221231403 - 2⁶ = 221221231339 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221221231409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1332657938 + ... + 1332658103.

It is an arithmetic number, because the mean of its divisors is an integer number (55971636882).

Almost surely, 2^221221231403 is an apocalyptic number.

221221231403 is a deficient number, since it is larger than the sum of its proper divisors (2665316125).

221221231403 is an equidigital number, since it uses as much as digits as its factorization.

221221231403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2665316124.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 221221231403 its reverse (304132122122), we get a palindrome (525353353525).

The spelling of 221221231403 in words is "two hundred twenty-one billion, two hundred twenty-one million, two hundred thirty-one thousand, four hundred three".