21222122012011 has 16 divisors (see below), whose sum is σ = 21976446592800. Its totient is φ = 20469310138368.

The previous prime is 21222122011997. The next prime is 21222122012057. The reversal of 21222122012011 is 11021022122212.

It is a cyclic number.

It is not a de Polignac number, because 21222122012011 - 2⁹ = 21222122011499 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21222122012011.

It is not an unprimeable number, because it can be changed into a prime (21222122013011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 111289995 + ... + 111480523.

It is an arithmetic number, because the mean of its divisors is an integer number (1373527912050).

Almost surely, 2^{21222122012011} is an apocalyptic number.

21222122012011 is a deficient number, since it is larger than the sum of its proper divisors (754324580789).

21222122012011 is a wasteful number, since it uses less digits than its factorization.

21222122012011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194478.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21222122012011 its reverse (11021022122212), we get a palindrome (32243144134223).

The spelling of 21222122012011 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred twenty-two million, twelve thousand, eleven".