1216242004 has 6 divisors (see below), whose sum is σ = 2128423514. Its totient is φ = 608121000.

The previous prime is 1216241993. The next prime is 1216242007. The reversal of 1216242004 is 4002426121.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 727920400 + 488321604 = 26980^2 + 22098^2 .

It is a super-2 number, since 2×1216242004² = 2958489224587872032, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216242007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 152030247 + ... + 152030254.

Almost surely, 2^1216242004 is an apocalyptic number.

It is an amenable number.

1216242004 is a deficient number, since it is larger than the sum of its proper divisors (912181510).

1216242004 is a wasteful number, since it uses less digits than its factorization.

1216242004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304060505 (or 304060503 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 1216242004 is about 34874.6613460260. The cubic root of 1216242004 is about 1067.4314622342.

Adding to 1216242004 its reverse (4002426121), we get a palindrome (5218668125).

The spelling of 1216242004 in words is "one billion, two hundred sixteen million, two hundred forty-two thousand, four".