21323212211 has 8 divisors (see below), whose sum is σ = 24389925120. Its totient is φ = 18261634248.

The previous prime is 21323212201. The next prime is 21323212223. The reversal of 21323212211 is 11221232312.

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 21323212211 - 2²⁶ = 21256103347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21323212201) 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, 1274831 + ... + 1291448.

It is an arithmetic number, because the mean of its divisors is an integer number (3048740640).

Almost surely, 2^21323212211 is an apocalyptic number.

21323212211 is a deficient number, since it is larger than the sum of its proper divisors (3066712909).

21323212211 is a wasteful number, since it uses less digits than its factorization.

21323212211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2567473.

The product of its digits is 288, while the sum is 20.

Adding to 21323212211 its reverse (11221232312), we get a palindrome (32544444523).

The spelling of 21323212211 in words is "twenty-one billion, three hundred twenty-three million, two hundred twelve thousand, two hundred eleven".