21121120100111 has 4 divisors (see below), whose sum is σ = 21121362822000. Its totient is φ = 21120877378224.

The previous prime is 21121120100099. The next prime is 21121120100147. The reversal of 21121120100111 is 11100102112112.

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 21121120100111 - 2³⁰ = 21120046358287 is a prime.

It is a super-2 number, since 2×21121120100111² (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 (21121120100011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121230371 + ... + 121404468.

It is an arithmetic number, because the mean of its divisors is an integer number (5280340705500).

Almost surely, 2^{21121120100111} is an apocalyptic number.

21121120100111 is a deficient number, since it is larger than the sum of its proper divisors (242721889).

21121120100111 is an equidigital number, since it uses as much as digits as its factorization.

21121120100111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242721888.

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

Adding to 21121120100111 its reverse (11100102112112), we get a palindrome (32221222212223).

The spelling of 21121120100111 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred twenty million, one hundred thousand, one hundred eleven".