21200211011211 has 16 divisors (see below), whose sum is σ = 28453324911648. Its totient is φ = 14040451526400.

The previous prime is 21200211011207. The next prime is 21200211011281. The reversal of 21200211011211 is 11211011200212.

It is a happy number.

It is not a de Polignac number, because 21200211011211 - 2² = 21200211011207 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21200211011281) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20234386 + ... + 21256311.

It is an arithmetic number, because the mean of its divisors is an integer number (1778332806978).

Almost surely, 2^{21200211011211} is an apocalyptic number.

21200211011211 is a deficient number, since it is larger than the sum of its proper divisors (7253113900437).

21200211011211 is a wasteful number, since it uses less digits than its factorization.

21200211011211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41491822.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21200211011211 its reverse (11211011200212), we get a palindrome (32411222211423).

The spelling of 21200211011211 in words is "twenty-one trillion, two hundred billion, two hundred eleven million, eleven thousand, two hundred eleven".