1216011330 has 48 divisors (see below), whose sum is σ = 3221295480. Its totient is φ = 318150144.

The previous prime is 1216011289. The next prime is 1216011347. The reversal of 1216011330 is 331106121.

1216011330 is a `hidden beast` number, since 1 + 21 + 601 + 13 + 30 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 1015250769 + 200760561 = 31863^2 + 14169^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 122695 + ... + 132234.

Almost surely, 2^1216011330 is an apocalyptic number.

1216011330 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1216011330 is an abundant number, since it is smaller than the sum of its proper divisors (2005284150).

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

1216011330 is a wasteful number, since it uses less digits than its factorization.

1216011330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254995 (or 254992 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 1216011330 is about 34871.3540029635. The cubic root of 1216011330 is about 1067.3639744994.

Adding to 1216011330 its reverse (331106121), we get a palindrome (1547117451).

The spelling of 1216011330 in words is "one billion, two hundred sixteen million, eleven thousand, three hundred thirty".