21100102220201 has 4 divisors (see below), whose sum is σ = 21254117565012. Its totient is φ = 20946086875392.

The previous prime is 21100102220189. The next prime is 21100102220293. The reversal of 21100102220201 is 10202220100112.

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

It can be written as a sum of positive squares in 2 ways, for example, as 8120510821801 + 12979591398400 = 2849651^2 + 3602720^2 .

It is a cyclic number.

It is not a de Polignac number, because 21100102220201 - 2³⁰ = 21099028478377 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21100102223201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77007672200 + ... + 77007672473.

It is an arithmetic number, because the mean of its divisors is an integer number (5313529391253).

Almost surely, 2^{21100102220201} is an apocalyptic number.

It is an amenable number.

21100102220201 is a deficient number, since it is larger than the sum of its proper divisors (154015344811).

21100102220201 is a wasteful number, since it uses less digits than its factorization.

21100102220201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154015344810.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21100102220201 its reverse (10202220100112), we get a palindrome (31302322320313).

The spelling of 21100102220201 in words is "twenty-one trillion, one hundred billion, one hundred two million, two hundred twenty thousand, two hundred one".