1211221043 has 2 divisors, whose sum is σ = 1211221044. Its totient is φ = 1211221042.

The previous prime is 1211221019. The next prime is 1211221073. The reversal of 1211221043 is 3401221121.

It is a weak prime.

It is an emirp because it is prime and its reverse (3401221121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1211221043 - 2⁶ = 1211220979 is a prime.

It is not a weakly prime, because it can be changed into another prime (1211221073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605610521 + 605610522.

It is an arithmetic number, because the mean of its divisors is an integer number (605610522).

Almost surely, 2^1211221043 is an apocalyptic number.

1211221043 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211221043 is an equidigital number, since it uses as much as digits as its factorization.

1211221043 is an evil number, because the sum of its binary digits is even.

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

The square root of 1211221043 is about 34802.6010953204. The cubic root of 1211221043 is about 1065.9605587290.

Adding to 1211221043 its reverse (3401221121), we get a palindrome (4612442164).

The spelling of 1211221043 in words is "one billion, two hundred eleven million, two hundred twenty-one thousand, forty-three".