21211120321 has 8 divisors (see below), whose sum is σ = 21421108800. Its totient is φ = 21001210032.

The previous prime is 21211120309. The next prime is 21211120331. The reversal of 21211120321 is 12302111212.

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 21211120321 - 2¹⁷ = 21210989249 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21211120295 and 21211120304.

It is not an unprimeable number, because it can be changed into a prime (21211120331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 632451 + ... + 665143.

It is an arithmetic number, because the mean of its divisors is an integer number (2677638600).

Almost surely, 2^21211120321 is an apocalyptic number.

It is an amenable number.

21211120321 is a deficient number, since it is larger than the sum of its proper divisors (209988479).

21211120321 is a wasteful number, since it uses less digits than its factorization.

21211120321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39095.

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

Adding to 21211120321 its reverse (12302111212), we get a palindrome (33513231533).

The spelling of 21211120321 in words is "twenty-one billion, two hundred eleven million, one hundred twenty thousand, three hundred twenty-one".