1212220211 has 2 divisors, whose sum is σ = 1212220212. Its totient is φ = 1212220210.

The previous prime is 1212220199. The next prime is 1212220223. The reversal of 1212220211 is 1120222121.

It is a balanced prime because it is at equal distance from previous prime (1212220199) and next prime (1212220223).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1212220211 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1212220291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606110105 + 606110106.

It is an arithmetic number, because the mean of its divisors is an integer number (606110106).

Almost surely, 2^1212220211 is an apocalyptic number.

1212220211 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212220211 is an equidigital number, since it uses as much as digits as its factorization.

1212220211 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 1212220211 is about 34816.9529252633. The cubic root of 1212220211 is about 1066.2535911062.

Adding to 1212220211 its reverse (1120222121), we get a palindrome (2332442332).

The spelling of 1212220211 in words is "one billion, two hundred twelve million, two hundred twenty thousand, two hundred eleven".