1216503523230 has 64 divisors (see below), whose sum is σ = 2988371232000. Its totient is φ = 316764999936.

The previous prime is 1216503523223. The next prime is 1216503523231. The reversal of 1216503523230 is 323253056121.

It is a junction number, because it is equal to n+sod(n) for n = 1216503523191 and 1216503523200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216503523231) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4378954 + ... + 4648466.

It is an arithmetic number, because the mean of its divisors is an integer number (46693300500).

Almost surely, 2^{1216503523230} is an apocalyptic number.

1216503523230 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1216503523230 is an abundant number, since it is smaller than the sum of its proper divisors (1771867708770).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1216503523230 is a wasteful number, since it uses less digits than its factorization.

1216503523230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273065.

The product of its (nonzero) digits is 32400, while the sum is 33.

Adding to 1216503523230 its reverse (323253056121), we get a palindrome (1539756579351).

The spelling of 1216503523230 in words is "one trillion, two hundred sixteen billion, five hundred three million, five hundred twenty-three thousand, two hundred thirty".