21320030221 has 16 divisors (see below), whose sum is σ = 25030187776. Its totient is φ = 17776215936.

The previous prime is 21320030201. The next prime is 21320030231. The reversal of 21320030221 is 12203002312.

It is a cyclic number.

It is not a de Polignac number, because 21320030221 - 2¹³ = 21320022029 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21320030195 and 21320030204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21320030201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1611385 + ... + 1624561.

It is an arithmetic number, because the mean of its divisors is an integer number (1564386736).

Almost surely, 2^21320030221 is an apocalyptic number.

It is an amenable number.

21320030221 is a deficient number, since it is larger than the sum of its proper divisors (3710157555).

21320030221 is a wasteful number, since it uses less digits than its factorization.

21320030221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19468.

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 21320030221 its reverse (12203002312), we get a palindrome (33523032533).

The spelling of 21320030221 in words is "twenty-one billion, three hundred twenty million, thirty thousand, two hundred twenty-one".