21121120111101 has 4 divisors (see below), whose sum is σ = 28161493481472. Its totient is φ = 14080746740732.

The previous prime is 21121120111097. The next prime is 21121120111103. The reversal of 21121120111101 is 10111102112112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21121120111101 - 2² = 21121120111097 is a prime.

It is a super-2 number, since 2×21121120111101² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121120111103) 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, 3520186685181 + ... + 3520186685186.

It is an arithmetic number, because the mean of its divisors is an integer number (7040373370368).

Almost surely, 2^{21121120111101} is an apocalyptic number.

It is an amenable number.

21121120111101 is a deficient number, since it is larger than the sum of its proper divisors (7040373370371).

21121120111101 is an equidigital number, since it uses as much as digits as its factorization.

21121120111101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7040373370370.

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 21121120111101 its reverse (10111102112112), we get a palindrome (31232222223213).

The spelling of 21121120111101 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred twenty million, one hundred eleven thousand, one hundred one".