211011220221 has 4 divisors (see below), whose sum is σ = 281348293632. Its totient is φ = 140674146812.

The previous prime is 211011220213. The next prime is 211011220241. The reversal of 211011220221 is 122022110112.

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 211011220221 - 2³ = 211011220213 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 211011220221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211011220241) 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, 35168536701 + ... + 35168536706.

It is an arithmetic number, because the mean of its divisors is an integer number (70337073408).

Almost surely, 2^211011220221 is an apocalyptic number.

It is an amenable number.

211011220221 is a deficient number, since it is larger than the sum of its proper divisors (70337073411).

211011220221 is an equidigital number, since it uses as much as digits as its factorization.

211011220221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70337073410.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 211011220221 its reverse (122022110112), we get a palindrome (333033330333).

The spelling of 211011220221 in words is "two hundred eleven billion, eleven million, two hundred twenty thousand, two hundred twenty-one".