21211010212321 has 8 divisors (see below), whose sum is σ = 21373124249664. Its totient is φ = 21048899174160.

The previous prime is 21211010212211. The next prime is 21211010212361. The reversal of 21211010212321 is 12321201011212.

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 21211010212321 - 2¹⁵ = 21211010179553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21211010212361) 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, 14653260 + ... + 16035586.

It is an arithmetic number, because the mean of its divisors is an integer number (2671640531208).

Almost surely, 2^{21211010212321} is an apocalyptic number.

It is an amenable number.

21211010212321 is a deficient number, since it is larger than the sum of its proper divisors (162114037343).

21211010212321 is a wasteful number, since it uses less digits than its factorization.

21211010212321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1499591.

The product of its (nonzero) digits is 96, while the sum is 19.

Adding to 21211010212321 its reverse (12321201011212), we get a palindrome (33532211223533).

The spelling of 21211010212321 in words is "twenty-one trillion, two hundred eleven billion, ten million, two hundred twelve thousand, three hundred twenty-one".