21210322321211 has 4 divisors (see below), whose sum is σ = 21210512938152. Its totient is φ = 21210131704272.

The previous prime is 21210322321189. The next prime is 21210322321241. The reversal of 21210322321211 is 11212322301212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21210322321211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21210322321241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 95141465 + ... + 95364138.

It is an arithmetic number, because the mean of its divisors is an integer number (5302628234538).

Almost surely, 2^{21210322321211} is an apocalyptic number.

21210322321211 is a deficient number, since it is larger than the sum of its proper divisors (190616941).

21210322321211 is a wasteful number, since it uses less digits than its factorization.

21210322321211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190616940.

The product of its (nonzero) digits is 576, while the sum is 23.

Adding to 21210322321211 its reverse (11212322301212), we get a palindrome (32422644622423).

The spelling of 21210322321211 in words is "twenty-one trillion, two hundred ten billion, three hundred twenty-two million, three hundred twenty-one thousand, two hundred eleven".