1212125042 has 4 divisors (see below), whose sum is σ = 1818187566. Its totient is φ = 606062520.

The previous prime is 1212125027. The next prime is 1212125059. The reversal of 1212125042 is 2405212121.

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

It can be written as a sum of positive squares in only one way, i.e., 890962801 + 321162241 = 29849^2 + 17921^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 303031259 + ... + 303031262.

Almost surely, 2^1212125042 is an apocalyptic number.

1212125042 is a deficient number, since it is larger than the sum of its proper divisors (606062524).

1212125042 is an equidigital number, since it uses as much as digits as its factorization.

1212125042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 606062523.

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 1212125042 is about 34815.5861935427. The cubic root of 1212125042 is about 1066.2256872257.

Adding to 1212125042 its reverse (2405212121), we get a palindrome (3617337163).

The spelling of 1212125042 in words is "one billion, two hundred twelve million, one hundred twenty-five thousand, forty-two".