21300012221 has 8 divisors (see below), whose sum is σ = 21344988000. Its totient is φ = 21255071760.

The previous prime is 21300012127. The next prime is 21300012229. The reversal of 21300012221 is 12221000312.

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 21300012221 - 2³⁰ = 20226270397 is a prime.

It is a super-2 number, since 2×21300012221² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21300012196 and 21300012205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21300012229) 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 7 ways as a sum of consecutive naturals, for example, 1441730 + ... + 1456428.

It is an arithmetic number, because the mean of its divisors is an integer number (2668123500).

Almost surely, 2^21300012221 is an apocalyptic number.

It is an amenable number.

21300012221 is a deficient number, since it is larger than the sum of its proper divisors (44975779).

21300012221 is a wasteful number, since it uses less digits than its factorization.

21300012221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17659.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21300012221 its reverse (12221000312), we get a palindrome (33521012533).

The spelling of 21300012221 in words is "twenty-one billion, three hundred million, twelve thousand, two hundred twenty-one".