221000211 has 16 divisors (see below), whose sum is σ = 328692000. Its totient is φ = 146755584.

The previous prime is 221000141. The next prime is 221000243. The reversal of 221000211 is 112000122.

It is not a de Polignac number, because 221000211 - 2¹⁷ = 220869139 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 221000193 and 221000202.

It is not an unprimeable number, because it can be changed into a prime (221000281) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8986 + ... + 22863.

It is an arithmetic number, because the mean of its divisors is an integer number (20543250).

Almost surely, 2^221000211 is an apocalyptic number.

221000211 is a deficient number, since it is larger than the sum of its proper divisors (107691789).

221000211 is a wasteful number, since it uses less digits than its factorization.

221000211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32115 (or 32109 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 221000211 is about 14866.0758440148. The cubic root of 221000211 is about 604.5945520136.

Adding to 221000211 its reverse (112000122), we get a palindrome (333000333).

The spelling of 221000211 in words is "two hundred twenty-one million, two hundred eleven", and thus it is an aban number.