21222001210211 has 4 divisors (see below), whose sum is σ = 21223350282024. Its totient is φ = 21220652138400.

The previous prime is 21222001210199. The next prime is 21222001210217. The reversal of 21222001210211 is 11201210022212.

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-21222001210211 is a prime.

It is a super-2 number, since 2×21222001210211² (a number of 27 digits) contains 22 as substring.

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 21222001210211.

It is not an unprimeable number, because it can be changed into a prime (21222001210217) 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, 674512310 + ... + 674543771.

It is an arithmetic number, because the mean of its divisors is an integer number (5305837570506).

Almost surely, 2^{21222001210211} is an apocalyptic number.

21222001210211 is a deficient number, since it is larger than the sum of its proper divisors (1349071813).

21222001210211 is a wasteful number, since it uses less digits than its factorization.

21222001210211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1349071812.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21222001210211 its reverse (11201210022212), we get a palindrome (32423211232423).

The spelling of 21222001210211 in words is "twenty-one trillion, two hundred twenty-two billion, one million, two hundred ten thousand, two hundred eleven".