1213020043 has 2 divisors, whose sum is σ = 1213020044. Its totient is φ = 1213020042.

The previous prime is 1213020041. The next prime is 1213020047. The reversal of 1213020043 is 3400203121.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1213020043 - 2¹ = 1213020041 is a prime.

Together with 1213020041, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 1213019999 and 1213020026.

It is not a weakly prime, because it can be changed into another prime (1213020041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606510021 + 606510022.

It is an arithmetic number, because the mean of its divisors is an integer number (606510022).

Almost surely, 2^1213020043 is an apocalyptic number.

1213020043 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213020043 is an equidigital number, since it uses as much as digits as its factorization.

1213020043 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 1213020043 is about 34828.4372747328. The cubic root of 1213020043 is about 1066.4880469245.

Adding to 1213020043 its reverse (3400203121), we get a palindrome (4613223164).

The spelling of 1213020043 in words is "one billion, two hundred thirteen million, twenty thousand, forty-three".