21423421330221 has 8 divisors (see below), whose sum is σ = 28729674848160. Its totient is φ = 14199724349552.

The previous prime is 21423421330193. The next prime is 21423421330261. The reversal of 21423421330221 is 12203312432412.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21423421330221 - 2¹⁷ = 21423421199149 is a prime.

It is a super-2 number, since 2×21423421330221² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21423421330261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20639133711 + ... + 20639134748.

It is an arithmetic number, because the mean of its divisors is an integer number (3591209356020).

Almost surely, 2^{21423421330221} is an apocalyptic number.

It is an amenable number.

21423421330221 is a deficient number, since it is larger than the sum of its proper divisors (7306253517939).

21423421330221 is a wasteful number, since it uses less digits than its factorization.

21423421330221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41278268635.

The product of its (nonzero) digits is 13824, while the sum is 30.

Adding to 21423421330221 its reverse (12203312432412), we get a palindrome (33626733762633).

The spelling of 21423421330221 in words is "twenty-one trillion, four hundred twenty-three billion, four hundred twenty-one million, three hundred thirty thousand, two hundred twenty-one".