21222121020011 has 4 divisors (see below), whose sum is σ = 21222223209000. Its totient is φ = 21222018831024.

The previous prime is 21222121019987. The next prime is 21222121020013. The reversal of 21222121020011 is 11002012122212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21222121020011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21222121020013) 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 3 ways as a sum of consecutive naturals, for example, 50782346 + ... + 51198543.

It is an arithmetic number, because the mean of its divisors is an integer number (5305555802250).

Almost surely, 2^{21222121020011} is an apocalyptic number.

21222121020011 is a deficient number, since it is larger than the sum of its proper divisors (102188989).

21222121020011 is a wasteful number, since it uses less digits than its factorization.

21222121020011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102188988.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21222121020011 its reverse (11002012122212), we get a palindrome (32224133142223).

The spelling of 21222121020011 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred twenty-one million, twenty thousand, eleven".