21102120002321 has 8 divisors (see below), whose sum is σ = 22212800973600. Its totient is φ = 19991443338720.

The previous prime is 21102120002239. The next prime is 21102120002329. The reversal of 21102120002321 is 12320002120112.

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 21102120002321 - 2²⁶ = 21102052893457 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 21102120002321.

It is not an unprimeable number, because it can be changed into a prime (21102120002329) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15602045 + ... + 16900533.

It is an arithmetic number, because the mean of its divisors is an integer number (2776600121700).

Almost surely, 2^{21102120002321} is an apocalyptic number.

It is an amenable number.

21102120002321 is a deficient number, since it is larger than the sum of its proper divisors (1110680971279).

21102120002321 is a wasteful number, since it uses less digits than its factorization.

21102120002321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2153839.

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

Adding to 21102120002321 its reverse (12320002120112), we get a palindrome (33422122122433).

The spelling of 21102120002321 in words is "twenty-one trillion, one hundred two billion, one hundred twenty million, two thousand, three hundred twenty-one".