21100222221201 has 6 divisors (see below), whose sum is σ = 30478098763970. Its totient is φ = 14066814814128.

The previous prime is 21100222221193. The next prime is 21100222221229. The reversal of 21100222221201 is 10212222200112.

It is a happy number.

21100222221201 is a `hidden beast` number, since 21 + 1 + 0 + 0 + 222 + 221 + 201 = 666.

It can be written as a sum of positive squares in only one way, i.e., 16815322221201 + 4284900000000 = 4100649^2 + 2070000^2 .

It is not a de Polignac number, because 21100222221201 - 2³ = 21100222221193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21100222228201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1172234567836 + ... + 1172234567853.

Almost surely, 2^{21100222221201} is an apocalyptic number.

It is an amenable number.

21100222221201 is a deficient number, since it is larger than the sum of its proper divisors (9377876542769).

21100222221201 is a wasteful number, since it uses less digits than its factorization.

21100222221201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2344469135695 (or 2344469135692 counting only the distinct ones).

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

Adding to 21100222221201 its reverse (10212222200112), we get a palindrome (31312444421313).

The spelling of 21100222221201 in words is "twenty-one trillion, one hundred billion, two hundred twenty-two million, two hundred twenty-one thousand, two hundred one".