1221010943 has 2 divisors, whose sum is σ = 1221010944. Its totient is φ = 1221010942.

The previous prime is 1221010937. The next prime is 1221010949. The reversal of 1221010943 is 3490101221.

It is a balanced prime because it is at equal distance from previous prime (1221010937) and next prime (1221010949).

It is a cyclic number.

It is not a de Polignac number, because 1221010943 - 2¹⁴ = 1220994559 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221010949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610505471 + 610505472.

It is an arithmetic number, because the mean of its divisors is an integer number (610505472).

Almost surely, 2^1221010943 is an apocalyptic number.

1221010943 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221010943 is an equidigital number, since it uses as much as digits as its factorization.

1221010943 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 1221010943 is about 34942.9670033900. The cubic root of 1221010943 is about 1068.8247914646.

The spelling of 1221010943 in words is "one billion, two hundred twenty-one million, ten thousand, nine hundred forty-three".