211110101120021 has 4 divisors (see below), whose sum is σ = 214688238427200. Its totient is φ = 207531963812844.

The previous prime is 211110101119991. The next prime is 211110101120029. The reversal of 211110101120021 is 120021101011112.

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 211110101120021 - 2¹⁰ = 211110101118997 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 211110101119978 and 211110101120005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211110101120029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1789068653501 + ... + 1789068653618.

It is an arithmetic number, because the mean of its divisors is an integer number (53672059606800).

Almost surely, 2^{211110101120021} is an apocalyptic number.

It is an amenable number.

211110101120021 is a deficient number, since it is larger than the sum of its proper divisors (3578137307179).

211110101120021 is an equidigital number, since it uses as much as digits as its factorization.

211110101120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3578137307178.

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

Adding to 211110101120021 its reverse (120021101011112), we get a palindrome (331131202131133).

The spelling of 211110101120021 in words is "two hundred eleven trillion, one hundred ten billion, one hundred one million, one hundred twenty thousand, twenty-one".