21102200212111 has 4 divisors (see below), whose sum is σ = 21170052946224. Its totient is φ = 21034347478000.

The previous prime is 21102200212103. The next prime is 21102200212147. The reversal of 21102200212111 is 11121200220112.

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 21102200212111 - 2³ = 21102200212103 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21102200212811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33926366590 + ... + 33926367211.

It is an arithmetic number, because the mean of its divisors is an integer number (5292513236556).

Almost surely, 2^{21102200212111} is an apocalyptic number.

21102200212111 is a deficient number, since it is larger than the sum of its proper divisors (67852734113).

21102200212111 is an equidigital number, since it uses as much as digits as its factorization.

21102200212111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67852734112.

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

Adding to 21102200212111 its reverse (11121200220112), we get a palindrome (32223400432223).

The spelling of 21102200212111 in words is "twenty-one trillion, one hundred two billion, two hundred million, two hundred twelve thousand, one hundred eleven".