21101101022201 has 4 divisors (see below), whose sum is σ = 21101159151732. Its totient is φ = 21101042892672.

The previous prime is 21101101022173. The next prime is 21101101022207. The reversal of 21101101022201 is 10222010110112.

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 8851458019600 + 12249643002601 = 2975140^2 + 3499949^2 .

It is a cyclic number.

It is not a de Polignac number, because 21101101022201 - 2¹⁸ = 21101100760057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21101101022207) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28516820 + ... + 29247413.

It is an arithmetic number, because the mean of its divisors is an integer number (5275289787933).

Almost surely, 2^{21101101022201} is an apocalyptic number.

It is an amenable number.

21101101022201 is a deficient number, since it is larger than the sum of its proper divisors (58129531).

21101101022201 is an equidigital number, since it uses as much as digits as its factorization.

21101101022201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58129530.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21101101022201 its reverse (10222010110112), we get a palindrome (31323111132313).

The spelling of 21101101022201 in words is "twenty-one trillion, one hundred one billion, one hundred one million, twenty-two thousand, two hundred one".