21433342221 has 6 divisors (see below), whose sum is σ = 30959272110. Its totient is φ = 14288894808.

The previous prime is 21433342213. The next prime is 21433342253. The reversal of 21433342221 is 12224333412.

21433342221 is a `hidden beast` number, since 2 + 1 + 433 + 3 + 4 + 2 + 221 = 666.

It can be written as a sum of positive squares in only one way, i.e., 20063306025 + 1370036196 = 141645^2 + 37014^2 .

It is not a de Polignac number, because 21433342221 - 2³ = 21433342213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21433342201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1190741226 + ... + 1190741243.

It is an arithmetic number, because the mean of its divisors is an integer number (5159878685).

Almost surely, 2^21433342221 is an apocalyptic number.

It is an amenable number.

21433342221 is a deficient number, since it is larger than the sum of its proper divisors (9525929889).

21433342221 is a wasteful number, since it uses less digits than its factorization.

21433342221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2381482475 (or 2381482472 counting only the distinct ones).

The product of its digits is 6912, while the sum is 27.

Adding to 21433342221 its reverse (12224333412), we get a palindrome (33657675633).

The spelling of 21433342221 in words is "twenty-one billion, four hundred thirty-three million, three hundred forty-two thousand, two hundred twenty-one".