221013211 has 4 divisors (see below), whose sum is σ = 221045032. Its totient is φ = 220981392.

The previous prime is 221013203. The next prime is 221013217. The reversal of 221013211 is 112310122.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 221013211 - 2³ = 221013203 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221013191 and 221013200.

It is not an unprimeable number, because it can be changed into a prime (221013217) 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, 546 + ... + 21031.

It is an arithmetic number, because the mean of its divisors is an integer number (55261258).

Almost surely, 2^221013211 is an apocalyptic number.

221013211 is a deficient number, since it is larger than the sum of its proper divisors (31821).

221013211 is a wasteful number, since it uses less digits than its factorization.

221013211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31820.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 221013211 is about 14866.5130746924. The cubic root of 221013211 is about 604.6064065650.

Adding to 221013211 its reverse (112310122), we get a palindrome (333323333).

The spelling of 221013211 in words is "two hundred twenty-one million, thirteen thousand, two hundred eleven".