1321240742 has 4 divisors (see below), whose sum is σ = 1981861116. Its totient is φ = 660620370.

The previous prime is 1321240721. The next prime is 1321240759. The reversal of 1321240742 is 2470421231.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330310184 + ... + 330310187.

It is an arithmetic number, because the mean of its divisors is an integer number (495465279).

Almost surely, 2^1321240742 is an apocalyptic number.

1321240742 is a deficient number, since it is larger than the sum of its proper divisors (660620374).

1321240742 is an equidigital number, since it uses as much as digits as its factorization.

1321240742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 660620373.

The product of its (nonzero) digits is 2688, while the sum is 26.

The square root of 1321240742 is about 36348.8753883803. The cubic root of 1321240742 is about 1097.3049013329.

Adding to 1321240742 its reverse (2470421231), we get a palindrome (3791661973).

The spelling of 1321240742 in words is "one billion, three hundred twenty-one million, two hundred forty thousand, seven hundred forty-two".