21102212311 has 4 divisors (see below), whose sum is σ = 21103330192. Its totient is φ = 21101094432.

The previous prime is 21102212267. The next prime is 21102212347. The reversal of 21102212311 is 11321220112.

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

It is a cyclic number.

It is not a de Polignac number, because 21102212311 - 2¹¹ = 21102210263 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21102212381) 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 3 ways as a sum of consecutive naturals, for example, 530130 + ... + 568543.

It is an arithmetic number, because the mean of its divisors is an integer number (5275832548).

Almost surely, 2^21102212311 is an apocalyptic number.

21102212311 is a deficient number, since it is larger than the sum of its proper divisors (1117881).

21102212311 is a wasteful number, since it uses less digits than its factorization.

21102212311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1117880.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 21102212311 its reverse (11321220112), we get a palindrome (32423432423).

The spelling of 21102212311 in words is "twenty-one billion, one hundred two million, two hundred twelve thousand, three hundred eleven".