21222221222211 has 8 divisors (see below), whose sum is σ = 28296921458880. Its totient is φ = 14147834233512.

The previous prime is 21222221222207. The next prime is 21222221222221. The reversal of 21222221222211 is 11222212222212.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21222221222211 - 2² = 21222221222207 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21222221222221) 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, 78153865 + ... + 78424938.

It is an arithmetic number, because the mean of its divisors is an integer number (3537115182360).

Almost surely, 2^{21222221222211} is an apocalyptic number.

21222221222211 is a deficient number, since it is larger than the sum of its proper divisors (7074700236669).

21222221222211 is a wasteful number, since it uses less digits than its factorization.

21222221222211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156623985.

The product of its digits is 1024, while the sum is 24.

Adding to 21222221222211 its reverse (11222212222212), we get a palindrome (32444433444423).

It can be divided in two parts, 2122222 and 1222211, that added together give a palindrome (3344433).

The spelling of 21222221222211 in words is "twenty-one trillion, two hundred twenty-two billion, two hundred twenty-one million, two hundred twenty-two thousand, two hundred eleven".