211222061 has 2 divisors, whose sum is σ = 211222062. Its totient is φ = 211222060.

The previous prime is 211222057. The next prime is 211222091. The reversal of 211222061 is 160222112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 131905225 + 79316836 = 11485^2 + 8906^2 .

It is a cyclic number.

It is not a de Polignac number, because 211222061 - 2² = 211222057 is a prime.

It is a super-2 number, since 2×211222061² = 89229518106175442, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211222091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105611030 + 105611031.

It is an arithmetic number, because the mean of its divisors is an integer number (105611031).

Almost surely, 2^211222061 is an apocalyptic number.

It is an amenable number.

211222061 is a deficient number, since it is larger than the sum of its proper divisors (1).

211222061 is an equidigital number, since it uses as much as digits as its factorization.

211222061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 211222061 is about 14533.4806911490. The cubic root of 211222061 is about 595.5429556486.

Adding to 211222061 its reverse (160222112), we get a palindrome (371444173).

The spelling of 211222061 in words is "two hundred eleven million, two hundred twenty-two thousand, sixty-one".