21222122121211 has 8 divisors (see below), whose sum is σ = 23233213041984. Its totient is φ = 19224665715720.

The previous prime is 21222122121197. The next prime is 21222122121223. The reversal of 21222122121211 is 11212122122212.

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 21222122121211 - 2¹⁵ = 21222122088443 is a prime.

It is a super-2 number, since 2×21222122121211² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21222122121281) 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, 3408625561 + ... + 3408631786.

It is an arithmetic number, because the mean of its divisors is an integer number (2904151630248).

Almost surely, 2^{21222122121211} is an apocalyptic number.

21222122121211 is a deficient number, since it is larger than the sum of its proper divisors (2011090920773).

21222122121211 is a wasteful number, since it uses less digits than its factorization.

21222122121211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6817257641.

The product of its digits is 256, while the sum is 22.

Adding to 21222122121211 its reverse (11212122122212), we get a palindrome (32434244243423).

The spelling of 21222122121211 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred twenty-two million, one hundred twenty-one thousand, two hundred eleven".