21211130221 has 16 divisors (see below), whose sum is σ = 21895660800. Its totient is φ = 20537026048.

The previous prime is 21211130191. The next prime is 21211130233. The reversal of 21211130221 is 12203111212.

It is a cyclic number.

It is not a de Polignac number, because 21211130221 - 2⁵ = 21211130189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21211130195 and 21211130204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211130021) 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, 3018450 + ... + 3025468.

It is an arithmetic number, because the mean of its divisors is an integer number (1368478800).

Almost surely, 2^21211130221 is an apocalyptic number.

It is an amenable number.

21211130221 is a deficient number, since it is larger than the sum of its proper divisors (684530579).

21211130221 is a wasteful number, since it uses less digits than its factorization.

21211130221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7748.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 21211130221 its reverse (12203111212), we get a palindrome (33414241433).

The spelling of 21211130221 in words is "twenty-one billion, two hundred eleven million, one hundred thirty thousand, two hundred twenty-one".