1216233213 has 32 divisors (see below), whose sum is σ = 1777894272. Its totient is φ = 735072000.

The previous prime is 1216233209. The next prime is 1216233259. The reversal of 1216233213 is 3123326121.

It is not a de Polignac number, because 1216233213 - 2² = 1216233209 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216233713) 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, 514831 + ... + 517187.

It is an arithmetic number, because the mean of its divisors is an integer number (55559196).

Almost surely, 2^1216233213 is an apocalyptic number.

1216233213 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1216233213 is a deficient number, since it is larger than the sum of its proper divisors (561661059).

1216233213 is a wasteful number, since it uses less digits than its factorization.

1216233213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2605.

The product of its digits is 1296, while the sum is 24.

The square root of 1216233213 is about 34874.5353087321. The cubic root of 1216233213 is about 1067.4288904290.

Adding to 1216233213 its reverse (3123326121), we get a palindrome (4339559334).

The spelling of 1216233213 in words is "one billion, two hundred sixteen million, two hundred thirty-three thousand, two hundred thirteen".