1216100642 has 8 divisors (see below), whose sum is σ = 1824477696. Its totient is φ = 607941412.

The previous prime is 1216100609. The next prime is 1216100647. The reversal of 1216100642 is 2460016121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (1216100647) 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, 39698 + ... + 63309.

It is an arithmetic number, because the mean of its divisors is an integer number (228059712).

Almost surely, 2^1216100642 is an apocalyptic number.

1216100642 is a deficient number, since it is larger than the sum of its proper divisors (608377054).

1216100642 is a wasteful number, since it uses less digits than its factorization.

1216100642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108912.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 1216100642 is about 34872.6345721111. The cubic root of 1216100642 is about 1067.3901053079.

Adding to 1216100642 its reverse (2460016121), we get a palindrome (3676116763).

The spelling of 1216100642 in words is "one billion, two hundred sixteen million, one hundred thousand, six hundred forty-two".