21202211 has 2 divisors, whose sum is σ = 21202212. Its totient is φ = 21202210.

The previous prime is 21202201. The next prime is 21202261. The reversal of 21202211 is 11220212.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21202211 - 2¹⁸ = 20940067 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 21202192 and 21202201.

It is not a weakly prime, because it can be changed into another prime (21202201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601105 + 10601106.

It is an arithmetic number, because the mean of its divisors is an integer number (10601106).

Almost surely, 2^21202211 is an apocalyptic number.

21202211 is a deficient number, since it is larger than the sum of its proper divisors (1).

21202211 is an equidigital number, since it uses as much as digits as its factorization.

21202211 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 21202211 is about 4604.5858662859. The cubic root of 21202211 is about 276.7751219121.

Adding to 21202211 its reverse (11220212), we get a palindrome (32422423).

The spelling of 21202211 in words is "twenty-one million, two hundred two thousand, two hundred eleven".