221140211 has 4 divisors (see below), whose sum is σ = 221435424. Its totient is φ = 220845000.

The previous prime is 221140187. The next prime is 221140223. The reversal of 221140211 is 112041122.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 112041122 = 2 ⋅56020561.

It is a cyclic number.

It is not a de Polignac number, because 221140211 - 2¹⁴ = 221123827 is a prime.

It is a super-2 number, since 2×221140211² = 97805985842249042, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221140291) 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, 146480 + ... + 147981.

It is an arithmetic number, because the mean of its divisors is an integer number (55358856).

Almost surely, 2^221140211 is an apocalyptic number.

221140211 is a deficient number, since it is larger than the sum of its proper divisors (295213).

221140211 is an equidigital number, since it uses as much as digits as its factorization.

221140211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 295212.

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 221140211 is about 14870.7838058389. The cubic root of 221140211 is about 604.7221919674.

Adding to 221140211 its reverse (112041122), we get a palindrome (333181333).

The spelling of 221140211 in words is "two hundred twenty-one million, one hundred forty thousand, two hundred eleven".