21121211000111 has 8 divisors (see below), whose sum is σ = 21144962872320. Its totient is φ = 21097460801592.

The previous prime is 21121211000083. The next prime is 21121211000167. The reversal of 21121211000111 is 11100011212112.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21121211000111 is a prime.

It is a super-2 number, since 2×21121211000111² (a number of 27 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 (21121211000171) 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, 25753766 + ... + 26561228.

It is an arithmetic number, because the mean of its divisors is an integer number (2643120359040).

Almost surely, 2^{21121211000111} is an apocalyptic number.

21121211000111 is a deficient number, since it is larger than the sum of its proper divisors (23751872209).

21121211000111 is an equidigital number, since it uses as much as digits as its factorization.

21121211000111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 836845.

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

Adding to 21121211000111 its reverse (11100011212112), we get a palindrome (32221222212223).

The spelling of 21121211000111 in words is "twenty-one trillion, one hundred twenty-one billion, two hundred eleven million, one hundred eleven", and thus it is an aban number.