2211201221 has 2 divisors, whose sum is σ = 2211201222. Its totient is φ = 2211201220.

The previous prime is 2211201199. The next prime is 2211201227. The reversal of 2211201221 is 1221021122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1861922500 + 349278721 = 43150^2 + 18689^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2211201221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2211201196 and 2211201205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2211201227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1105600610 + 1105600611.

It is an arithmetic number, because the mean of its divisors is an integer number (1105600611).

Almost surely, 2^2211201221 is an apocalyptic number.

It is an amenable number.

2211201221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2211201221 is an equidigital number, since it uses as much as digits as its factorization.

2211201221 is an evil number, because the sum of its binary digits is even.

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

The square root of 2211201221 is about 47023.4114138904. The cubic root of 2211201221 is about 1302.7950161569.

Adding to 2211201221 its reverse (1221021122), we get a palindrome (3432222343).

The spelling of 2211201221 in words is "two billion, two hundred eleven million, two hundred one thousand, two hundred twenty-one".