21100211211 has 8 divisors (see below), whose sum is σ = 28266950464. Its totient is φ = 14000139720.

The previous prime is 21100211191. The next prime is 21100211219. The reversal of 21100211211 is 11211200112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21100211211 - 2¹⁸ = 21099949067 is a prime.

It is a Duffinian number.

21100211211 is a modest number, since divided by 211211 gives 21100 as remainder.

It is not an unprimeable number, because it can be changed into a prime (21100211219) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16666201 + ... + 16667466.

It is an arithmetic number, because the mean of its divisors is an integer number (3533368808).

Almost surely, 2^21100211211 is an apocalyptic number.

21100211211 is a deficient number, since it is larger than the sum of its proper divisors (7166739253).

21100211211 is a wasteful number, since it uses less digits than its factorization.

21100211211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33333881.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21100211211 its reverse (11211200112), we get a palindrome (32311411323).

The spelling of 21100211211 in words is "twenty-one billion, one hundred million, two hundred eleven thousand, two hundred eleven".