1212420043 has 4 divisors (see below), whose sum is σ = 1212586200. Its totient is φ = 1212253888.

The previous prime is 1212420019. The next prime is 1212420047. The reversal of 1212420043 is 3400242121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1212420043 - 2⁹ = 1212419531 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1212420043.

It is not an unprimeable number, because it can be changed into a prime (1212420047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71605 + ... + 86902.

It is an arithmetic number, because the mean of its divisors is an integer number (303146550).

Almost surely, 2^1212420043 is an apocalyptic number.

1212420043 is a deficient number, since it is larger than the sum of its proper divisors (166157).

1212420043 is an equidigital number, since it uses as much as digits as its factorization.

1212420043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166156.

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

The square root of 1212420043 is about 34819.8225584221. The cubic root of 1212420043 is about 1066.3121777884.

Adding to 1212420043 its reverse (3400242121), we get a palindrome (4612662164).

The spelling of 1212420043 in words is "one billion, two hundred twelve million, four hundred twenty thousand, forty-three".