21101202201121 has 4 divisors (see below), whose sum is σ = 24115659658432. Its totient is φ = 18086744743812.

The previous prime is 21101202201119. The next prime is 21101202201133. The reversal of 21101202201121 is 12110220210112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21101202201121 - 2¹ = 21101202201119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21101202201095 and 21101202201104.

It is not an unprimeable number, because it can be changed into a prime (21101202291121) 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 3 ways as a sum of consecutive naturals, for example, 1507228728645 + ... + 1507228728658.

It is an arithmetic number, because the mean of its divisors is an integer number (6028914914608).

Almost surely, 2^{21101202201121} is an apocalyptic number.

It is an amenable number.

21101202201121 is a deficient number, since it is larger than the sum of its proper divisors (3014457457311).

21101202201121 is an equidigital number, since it uses as much as digits as its factorization.

21101202201121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3014457457310.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21101202201121 its reverse (12110220210112), we get a palindrome (33211422411233).

The spelling of 21101202201121 in words is "twenty-one trillion, one hundred one billion, two hundred two million, two hundred one thousand, one hundred twenty-one".