1216205132 has 24 divisors (see below), whose sum is σ = 2297484000. Its totient is φ = 561604736.

The previous prime is 1216205131. The next prime is 1216205141. The reversal of 1216205132 is 2315026121.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a junction number, because it is equal to n+sod(n) for n = 1216205098 and 1216205107.

It is not an unprimeable number, because it can be changed into a prime (1216205131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 225257 + ... + 230592.

It is an arithmetic number, because the mean of its divisors is an integer number (95728500).

Almost surely, 2^1216205132 is an apocalyptic number.

It is an amenable number.

1216205132 is a deficient number, since it is larger than the sum of its proper divisors (1081278868).

1216205132 is a wasteful number, since it uses less digits than its factorization.

1216205132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 455905 (or 455903 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 1216205132 is about 34874.1327060617. The cubic root of 1216205132 is about 1067.4206752553.

The spelling of 1216205132 in words is "one billion, two hundred sixteen million, two hundred five thousand, one hundred thirty-two".