1218921334 has 4 divisors (see below), whose sum is σ = 1828382004. Its totient is φ = 609460666.

The previous prime is 1218921331. The next prime is 1218921427. The reversal of 1218921334 is 4331298121.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 1218921334.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1218921331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 304730332 + ... + 304730335.

It is an arithmetic number, because the mean of its divisors is an integer number (457095501).

Almost surely, 2^1218921334 is an apocalyptic number.

1218921334 is a deficient number, since it is larger than the sum of its proper divisors (609460670).

1218921334 is an equidigital number, since it uses as much as digits as its factorization.

1218921334 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 609460669.

The product of its digits is 10368, while the sum is 34.

The square root of 1218921334 is about 34913.0539197017. The cubic root of 1218921334 is about 1068.2147228963.

The spelling of 1218921334 in words is "one billion, two hundred eighteen million, nine hundred twenty-one thousand, three hundred thirty-four".