211110010021 has 4 divisors (see below), whose sum is σ = 222221063200. Its totient is φ = 199998956844.

The previous prime is 211110009991. The next prime is 211110010141. The reversal of 211110010021 is 120010011112.

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 211110010021 - 2⁵ = 211110009989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211110017021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5555526561 + ... + 5555526598.

It is an arithmetic number, because the mean of its divisors is an integer number (55555265800).

Almost surely, 2^211110010021 is an apocalyptic number.

It is an amenable number.

211110010021 is a deficient number, since it is larger than the sum of its proper divisors (11111053179).

211110010021 is a wasteful number, since it uses less digits than its factorization.

211110010021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11111053178.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 211110010021 its reverse (120010011112), we get a palindrome (331120021133).

The spelling of 211110010021 in words is "two hundred eleven billion, one hundred ten million, ten thousand, twenty-one".