221221403410221 has 24 divisors (see below), whose sum is σ = 338404972089600. Its totient is φ = 138778363844736.

The previous prime is 221221403410211. The next prime is 221221403410253. The reversal of 221221403410221 is 122014304122122.

221221403410221 is a `hidden beast` number, since 2 + 2 + 1 + 2 + 21 + 4 + 0 + 3 + 410 + 221 = 666.

It is not a de Polignac number, because 221221403410221 - 2⁶ = 221221403410157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221221403410211) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 141001725 + ... + 142562018.

It is an arithmetic number, because the mean of its divisors is an integer number (14100207170400).

Almost surely, 2^{221221403410221} is an apocalyptic number.

It is an amenable number.

221221403410221 is a deficient number, since it is larger than the sum of its proper divisors (117183568679379).

221221403410221 is a wasteful number, since it uses less digits than its factorization.

221221403410221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283568865 (or 283568862 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

Adding to 221221403410221 its reverse (122014304122122), we get a palindrome (343235707532343).

The spelling of 221221403410221 in words is "two hundred twenty-one trillion, two hundred twenty-one billion, four hundred three million, four hundred ten thousand, two hundred twenty-one".