21021022112211 has 24 divisors (see below), whose sum is σ = 35072507484144. Its totient is φ = 11990600847360.

The previous prime is 21021022112201. The next prime is 21021022112219. The reversal of 21021022112211 is 11221122012012.

21021022112211 is a `hidden beast` number, since 2 + 10 + 210 + 221 + 1 + 221 + 1 = 666.

It is not a de Polignac number, because 21021022112211 - 2⁶ = 21021022112147 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21021022112219) 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 23 ways as a sum of consecutive naturals, for example, 6245102926 + ... + 6245106291.

It is an arithmetic number, because the mean of its divisors is an integer number (1461354478506).

Almost surely, 2^{21021022112211} is an apocalyptic number.

21021022112211 is a deficient number, since it is larger than the sum of its proper divisors (14051485371933).

21021022112211 is a wasteful number, since it uses less digits than its factorization.

21021022112211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12490209251 (or 12490209248 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 21021022112211 its reverse (11221122012012), we get a palindrome (32242144124223).

The spelling of 21021022112211 in words is "twenty-one trillion, twenty-one billion, twenty-two million, one hundred twelve thousand, two hundred eleven".