21022221122001 has 12 divisors (see below), whose sum is σ = 33125924192400. Its totient is φ = 12740740073880.

The previous prime is 21022221121999. The next prime is 21022221122011. The reversal of 21022221122001 is 10022112222012.

It is a happy number.

21022221122001 is a `hidden beast` number, since 2 + 10 + 222 + 211 + 220 + 0 + 1 = 666.

It is not a de Polignac number, because 21022221122001 - 2¹ = 21022221121999 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21022221122011) 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 11 ways as a sum of consecutive naturals, for example, 106172833851 + ... + 106172834048.

It is an arithmetic number, because the mean of its divisors is an integer number (2760493682700).

Almost surely, 2^{21022221122001} is an apocalyptic number.

It is an amenable number.

21022221122001 is a deficient number, since it is larger than the sum of its proper divisors (12103703070399).

21022221122001 is a wasteful number, since it uses less digits than its factorization.

21022221122001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212345667916 (or 212345667913 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21022221122001 its reverse (10022112222012), we get a palindrome (31044333344013).

It can be divided in two parts, 2102222 and 1122001, that added together give a palindrome (3224223).

The spelling of 21022221122001 in words is "twenty-one trillion, twenty-two billion, two hundred twenty-one million, one hundred twenty-two thousand, one".