21342005221 has 8 divisors (see below), whose sum is σ = 21430281600. Its totient is φ = 21253855440.

The previous prime is 21342005203. The next prime is 21342005231. The reversal of 21342005221 is 12250024312.

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 21342005221 - 2⁷ = 21342005093 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21342005192 and 21342005201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21342005231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 313960 + ... + 375838.

It is an arithmetic number, because the mean of its divisors is an integer number (2678785200).

Almost surely, 2^21342005221 is an apocalyptic number.

It is an amenable number.

21342005221 is a deficient number, since it is larger than the sum of its proper divisors (88276379).

21342005221 is a wasteful number, since it uses less digits than its factorization.

21342005221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63299.

The product of its (nonzero) digits is 960, while the sum is 22.

Adding to 21342005221 its reverse (12250024312), we get a palindrome (33592029533).

The spelling of 21342005221 in words is "twenty-one billion, three hundred forty-two million, five thousand, two hundred twenty-one".