1216213260 has 48 divisors (see below), whose sum is σ = 3469658976. Its totient is φ = 318203392.

The previous prime is 1216213259. The next prime is 1216213261. The reversal of 1216213260 is 623126121.

It is an interprime number because it is at equal distance from previous prime (1216213259) and next prime (1216213261).

It is a self number, because there is not a number n which added to its sum of digits gives 1216213260.

It is not an unprimeable number, because it can be changed into a prime (1216213261) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 188049 + ... + 194408.

It is an arithmetic number, because the mean of its divisors is an integer number (72284562).

Almost surely, 2^1216213260 is an apocalyptic number.

1216213260 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1216213260 is an abundant number, since it is smaller than the sum of its proper divisors (2253445716).

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

1216213260 is a wasteful number, since it uses less digits than its factorization.

1216213260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 382522 (or 382520 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 1216213260 is about 34874.2492392309. The cubic root of 1216213260 is about 1067.4230531370.

Adding to 1216213260 its reverse (623126121), we get a palindrome (1839339381).

The spelling of 1216213260 in words is "one billion, two hundred sixteen million, two hundred thirteen thousand, two hundred sixty".