211020002221 has 4 divisors (see below), whose sum is σ = 241165716832. Its totient is φ = 180874287612.

The previous prime is 211020002209. The next prime is 211020002231. The reversal of 211020002221 is 122200020112.

It is a happy number.

211020002221 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 211020002221 - 2²¹ = 211017905069 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 (211020002201) 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, 15072857295 + ... + 15072857308.

It is an arithmetic number, because the mean of its divisors is an integer number (60291429208).

Almost surely, 2^211020002221 is an apocalyptic number.

It is an amenable number.

211020002221 is a deficient number, since it is larger than the sum of its proper divisors (30145714611).

211020002221 is an equidigital number, since it uses as much as digits as its factorization.

211020002221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30145714610.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 211020002221 its reverse (122200020112), we get a palindrome (333220022333).

The spelling of 211020002221 in words is "two hundred eleven billion, twenty million, two thousand, two hundred twenty-one".