1216224002506 has 4 divisors (see below), whose sum is σ = 1824336003762. Its totient is φ = 608112001252.

The previous prime is 1216224002479. The next prime is 1216224002573. The reversal of 1216224002506 is 6052004226121.

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

It can be written as a sum of positive squares in only one way, i.e., 746781147225 + 469442855281 = 864165^2 + 685159^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 304056000625 + ... + 304056000628.

Almost surely, 2^{1216224002506} is an apocalyptic number.

1216224002506 is a deficient number, since it is larger than the sum of its proper divisors (608112001256).

1216224002506 is an equidigital number, since it uses as much as digits as its factorization.

1216224002506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 608112001255.

The product of its (nonzero) digits is 11520, while the sum is 31.

Adding to 1216224002506 its reverse (6052004226121), we get a palindrome (7268228228627).

The spelling of 1216224002506 in words is "one trillion, two hundred sixteen billion, two hundred twenty-four million, two thousand, five hundred six".