21022222112011 has 16 divisors (see below), whose sum is σ = 21972884068800. Its totient is φ = 20087672185728.

The previous prime is 21022222112009. The next prime is 21022222112057. The reversal of 21022222112011 is 11021122222012.

It is not a de Polignac number, because 21022222112011 - 2¹ = 21022222112009 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21022222112011.

It is not an unprimeable number, because it can be changed into a prime (21022222112071) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8368560 + ... + 10586653.

It is an arithmetic number, because the mean of its divisors is an integer number (1373305254300).

Almost surely, 2^{21022222112011} is an apocalyptic number.

21022222112011 is a deficient number, since it is larger than the sum of its proper divisors (950661956789).

21022222112011 is a wasteful number, since it uses less digits than its factorization.

21022222112011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18955638.

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

Adding to 21022222112011 its reverse (11021122222012), we get a palindrome (32043344334023).

The spelling of 21022222112011 in words is "twenty-one trillion, twenty-two billion, two hundred twenty-two million, one hundred twelve thousand, eleven".