221838211 has 8 divisors (see below), whose sum is σ = 254397024. Its totient is φ = 189496320.

The previous prime is 221838191. The next prime is 221838223. The reversal of 221838211 is 112838122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221838211 - 2¹⁷ = 221707139 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221838211.

It is not an unprimeable number, because it can be changed into a prime (221838251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52030 + ... + 56131.

It is an arithmetic number, because the mean of its divisors is an integer number (31799628).

Almost surely, 2^221838211 is an apocalyptic number.

221838211 is a deficient number, since it is larger than the sum of its proper divisors (32558813).

221838211 is a wasteful number, since it uses less digits than its factorization.

221838211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108461.

The product of its digits is 1536, while the sum is 28.

The square root of 221838211 is about 14894.2341528526. The cubic root of 221838211 is about 605.3577657636.

The spelling of 221838211 in words is "two hundred twenty-one million, eight hundred thirty-eight thousand, two hundred eleven".