21221111202211 has 2 divisors, whose sum is σ = 21221111202212. Its totient is φ = 21221111202210.

The previous prime is 21221111202199. The next prime is 21221111202271. The reversal of 21221111202211 is 11220211112212.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21221111202211 is a prime.

It is not a weakly prime, because it can be changed into another prime (21221111202271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610555601105 + 10610555601106.

It is an arithmetic number, because the mean of its divisors is an integer number (10610555601106).

Almost surely, 2^{21221111202211} is an apocalyptic number.

21221111202211 is a deficient number, since it is larger than the sum of its proper divisors (1).

21221111202211 is an equidigital number, since it uses as much as digits as its factorization.

21221111202211 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 21221111202211 its reverse (11220211112212), we get a palindrome (32441322314423).

The spelling of 21221111202211 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred eleven million, two hundred two thousand, two hundred eleven".