21201100221211 has 4 divisors (see below), whose sum is σ = 21201115701312. Its totient is φ = 21201084741112.

The previous prime is 21201100221193. The next prime is 21201100221239. The reversal of 21201100221211 is 11212200110212.

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

It is a cyclic number.

It is not a de Polignac number, because 21201100221211 - 2¹⁷ = 21201100090139 is a prime.

It is a super-2 number, since 2×21201100221211² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21201100221811) 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, 5462251 + ... + 8499316.

It is an arithmetic number, because the mean of its divisors is an integer number (5300278925328).

Almost surely, 2^{21201100221211} is an apocalyptic number.

21201100221211 is a deficient number, since it is larger than the sum of its proper divisors (15480101).

21201100221211 is a wasteful number, since it uses less digits than its factorization.

21201100221211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15480100.

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

Adding to 21201100221211 its reverse (11212200110212), we get a palindrome (32413300331423).

The spelling of 21201100221211 in words is "twenty-one trillion, two hundred one billion, one hundred million, two hundred twenty-one thousand, two hundred eleven".