1216332427 has 16 divisors (see below), whose sum is σ = 1248307200. Its totient is φ = 1184901120.

The previous prime is 1216332419. The next prime is 1216332431. The reversal of 1216332427 is 7242336121.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1216332427 - 2³ = 1216332419 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1216336427) 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, 2821902 + ... + 2822332.

It is an arithmetic number, because the mean of its divisors is an integer number (78019200).

Almost surely, 2^1216332427 is an apocalyptic number.

1216332427 is a deficient number, since it is larger than the sum of its proper divisors (31974773).

1216332427 is a wasteful number, since it uses less digits than its factorization.

1216332427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 906.

The product of its digits is 12096, while the sum is 31.

The square root of 1216332427 is about 34875.9577216168. The cubic root of 1216332427 is about 1067.4579147447.

Adding to 1216332427 its reverse (7242336121), we get a palindrome (8458668548).

The spelling of 1216332427 in words is "one billion, two hundred sixteen million, three hundred thirty-two thousand, four hundred twenty-seven".