211221011000111 has 4 divisors (see below), whose sum is σ = 241395441142992. Its totient is φ = 181046580857232.

The previous prime is 211221011000107. The next prime is 211221011000117. The reversal of 211221011000111 is 111000110122112.

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 211221011000111 - 2² = 211221011000107 is a prime.

It is a super-2 number, since 2×211221011000111² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211221011000117) 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, 15087215071430 + ... + 15087215071443.

It is an arithmetic number, because the mean of its divisors is an integer number (60348860285748).

Almost surely, 2^{211221011000111} is an apocalyptic number.

211221011000111 is a deficient number, since it is larger than the sum of its proper divisors (30174430142881).

211221011000111 is an equidigital number, since it uses as much as digits as its factorization.

211221011000111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30174430142880.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 211221011000111 its reverse (111000110122112), we get a palindrome (322221121122223).

The spelling of 211221011000111 in words is "two hundred eleven trillion, two hundred twenty-one billion, eleven million, one hundred eleven", and thus it is an aban number.