21212302211 has 8 divisors (see below), whose sum is σ = 22462292160. Its totient is φ = 19962557568.

The previous prime is 21212302169. The next prime is 21212302219. The reversal of 21212302211 is 11220321212.

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 21212302211 - 2⁶ = 21212302147 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

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 21212302211.

It is not an unprimeable number, because it can be changed into a prime (21212302219) 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, 134630 + ... + 246068.

It is an arithmetic number, because the mean of its divisors is an integer number (2807786520).

Almost surely, 2^21212302211 is an apocalyptic number.

21212302211 is a deficient number, since it is larger than the sum of its proper divisors (1249989949).

21212302211 is a wasteful number, since it uses less digits than its factorization.

21212302211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122653.

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

Adding to 21212302211 its reverse (11220321212), we get a palindrome (32432623423).

The spelling of 21212302211 in words is "twenty-one billion, two hundred twelve million, three hundred two thousand, two hundred eleven".