21220101220211 has 2 divisors, whose sum is σ = 21220101220212. Its totient is φ = 21220101220210.

The previous prime is 21220101220189. The next prime is 21220101220229. The reversal of 21220101220211 is 11202210102212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21220101220211 - 2⁶ = 21220101220147 is a prime.

It is a super-2 number, since 2×21220101220211² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21220101220211.

It is not a weakly prime, because it can be changed into another prime (21220101220411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610050610105 + 10610050610106.

It is an arithmetic number, because the mean of its divisors is an integer number (10610050610106).

Almost surely, 2^{21220101220211} is an apocalyptic number.

21220101220211 is a deficient number, since it is larger than the sum of its proper divisors (1).

21220101220211 is an equidigital number, since it uses as much as digits as its factorization.

21220101220211 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 17.

Adding to 21220101220211 its reverse (11202210102212), we get a palindrome (32422311322423).

The spelling of 21220101220211 in words is "twenty-one trillion, two hundred twenty billion, one hundred one million, two hundred twenty thousand, two hundred eleven".