21222222011 has 8 divisors (see below), whose sum is σ = 22489488000. Its totient is φ = 19990653760.

The previous prime is 21222222001. The next prime is 21222222031. The reversal of 21222222011 is 11022222212.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21222222011 is a prime.

It is a super-3 number, since 3×21222222011³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21222222001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8923211 + ... + 8925588.

It is an arithmetic number, because the mean of its divisors is an integer number (2811186000).

Almost surely, 2^21222222011 is an apocalyptic number.

21222222011 is a deficient number, since it is larger than the sum of its proper divisors (1267265989).

21222222011 is a wasteful number, since it uses less digits than its factorization.

21222222011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17848869.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21222222011 its reverse (11022222212), we get a palindrome (32244444223).

The spelling of 21222222011 in words is "twenty-one billion, two hundred twenty-two million, two hundred twenty-two thousand, eleven".