211102210021 has 4 divisors (see below), whose sum is σ = 211103654112. Its totient is φ = 211100765932.

The previous prime is 211102210019. The next prime is 211102210079. The reversal of 211102210021 is 120012201112.

211102210021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 211102210021 - 2¹ = 211102210019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211102209983 and 211102210010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211102610021) 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, 474475 + ... + 804568.

It is an arithmetic number, because the mean of its divisors is an integer number (52775913528).

Almost surely, 2^211102210021 is an apocalyptic number.

It is an amenable number.

211102210021 is a deficient number, since it is larger than the sum of its proper divisors (1444091).

211102210021 is a wasteful number, since it uses less digits than its factorization.

211102210021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1444090.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 211102210021 its reverse (120012201112), we get a palindrome (331114411133).

The spelling of 211102210021 in words is "two hundred eleven billion, one hundred two million, two hundred ten thousand, twenty-one".