1321240142 has 4 divisors (see below), whose sum is σ = 1981860216. Its totient is φ = 660620070.

The previous prime is 1321240139. The next prime is 1321240147. The reversal of 1321240142 is 2410421231.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321240147) 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 as a sum of consecutive naturals, namely, 330310034 + ... + 330310037.

It is an arithmetic number, because the mean of its divisors is an integer number (495465054).

Almost surely, 2^1321240142 is an apocalyptic number.

1321240142 is a deficient number, since it is larger than the sum of its proper divisors (660620074).

1321240142 is an equidigital number, since it uses as much as digits as its factorization.

1321240142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 660620073.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 1321240142 is about 36348.8671350291. The cubic root of 1321240142 is about 1097.3047352307.

Adding to 1321240142 its reverse (2410421231), we get a palindrome (3731661373).

The spelling of 1321240142 in words is "one billion, three hundred twenty-one million, two hundred forty thousand, one hundred forty-two".