1242120043 has 2 divisors, whose sum is σ = 1242120044. Its totient is φ = 1242120042.

The previous prime is 1242120029. The next prime is 1242120049. The reversal of 1242120043 is 3400212421.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1242120043 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1242120043.

It is not a weakly prime, because it can be changed into another prime (1242120049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621060021 + 621060022.

It is an arithmetic number, because the mean of its divisors is an integer number (621060022).

Almost surely, 2^1242120043 is an apocalyptic number.

1242120043 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242120043 is an equidigital number, since it uses as much as digits as its factorization.

1242120043 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 1242120043 is about 35243.7234553899. The cubic root of 1242120043 is about 1074.9489914142.

Adding to 1242120043 its reverse (3400212421), we get a palindrome (4642332464).

The spelling of 1242120043 in words is "one billion, two hundred forty-two million, one hundred twenty thousand, forty-three".