1216621004 has 12 divisors (see below), whose sum is σ = 2132465328. Its totient is φ = 607345200.

The previous prime is 1216621001. The next prime is 1216621033. The reversal of 1216621004 is 4001266121.

It is not an unprimeable number, because it can be changed into a prime (1216621001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 238487 + ... + 243534.

It is an arithmetic number, because the mean of its divisors is an integer number (177705444).

Almost surely, 2^1216621004 is an apocalyptic number.

It is an amenable number.

1216621004 is a deficient number, since it is larger than the sum of its proper divisors (915844324).

1216621004 is a wasteful number, since it uses less digits than its factorization.

1216621004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 482656 (or 482654 counting only the distinct ones).

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

The square root of 1216621004 is about 34880.0946673027. The cubic root of 1216621004 is about 1067.5423268231.

Adding to 1216621004 its reverse (4001266121), we get a palindrome (5217887125).

The spelling of 1216621004 in words is "one billion, two hundred sixteen million, six hundred twenty-one thousand, four".