221434343221 has 24 divisors (see below), whose sum is σ = 278187386904. Its totient is φ = 174704302080.

The previous prime is 221434343213. The next prime is 221434343303. The reversal of 221434343221 is 122343434122.

It can be written as a sum of positive squares in 4 ways, for example, as 5850567121 + 215583776100 = 76489^2 + 464310^2 .

It is not a de Polignac number, because 221434343221 - 2³ = 221434343213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221434343521) 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, 267520 + ... + 717241.

It is an arithmetic number, because the mean of its divisors is an integer number (11591141121).

Almost surely, 2^221434343221 is an apocalyptic number.

It is an amenable number.

221434343221 is a deficient number, since it is larger than the sum of its proper divisors (56753043683).

221434343221 is a wasteful number, since it uses less digits than its factorization.

221434343221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 985141 (or 985134 counting only the distinct ones).

The product of its digits is 27648, while the sum is 31.

Adding to 221434343221 its reverse (122343434122), we get a palindrome (343777777343).

Subtracting from 221434343221 its reverse (122343434122), we obtain a palindrome (99090909099).

The spelling of 221434343221 in words is "two hundred twenty-one billion, four hundred thirty-four million, three hundred forty-three thousand, two hundred twenty-one".