21101222321 has 8 divisors (see below), whose sum is σ = 21829584384. Its totient is φ = 20375840160.

The previous prime is 21101222291. The next prime is 21101222357. The reversal of 21101222321 is 12322210112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21101222321 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21101222321.

It is not an unprimeable number, because it can be changed into a prime (21101222221) 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, 730565 + ... + 758898.

It is an arithmetic number, because the mean of its divisors is an integer number (2728698048).

Almost surely, 2^21101222321 is an apocalyptic number.

It is an amenable number.

21101222321 is a deficient number, since it is larger than the sum of its proper divisors (728362063).

21101222321 is a wasteful number, since it uses less digits than its factorization.

21101222321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1489951.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21101222321 its reverse (12322210112), we get a palindrome (33423432433).

The spelling of 21101222321 in words is "twenty-one billion, one hundred one million, two hundred twenty-two thousand, three hundred twenty-one".