21222212121211 has 8 divisors (see below), whose sum is σ = 22278101299200. Its totient is φ = 20189529298920.

The previous prime is 21222212121197. The next prime is 21222212121223. The reversal of 21222212121211 is 11212121222212.

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 21222212121211 - 2¹³ = 21222212113019 is a prime.

It is a super-2 number, since 2×21222212121211² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21222212121511) 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, 5801587051 + ... + 5801590708.

It is an arithmetic number, because the mean of its divisors is an integer number (2784762662400).

Almost surely, 2^{21222212121211} is an apocalyptic number.

21222212121211 is a deficient number, since it is larger than the sum of its proper divisors (1055889177989).

21222212121211 is a wasteful number, since it uses less digits than its factorization.

21222212121211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11603177849.

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

Adding to 21222212121211 its reverse (11212121222212), we get a palindrome (32434333343423).

The spelling of 21222212121211 in words is "twenty-one trillion, two hundred twenty-two billion, two hundred twelve million, one hundred twenty-one thousand, two hundred eleven".