1216331130 has 64 divisors (see below), whose sum is σ = 3532481280. Its totient is φ = 261663744.

The previous prime is 1216331117. The next prime is 1216331177. The reversal of 1216331130 is 311336121.

It is a super-2 number, since 2×1216331130² = 2958922835614153800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 1216331097 and 1216331106.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 166785 + ... + 173924.

It is an arithmetic number, because the mean of its divisors is an integer number (55195020).

Almost surely, 2^1216331130 is an apocalyptic number.

1216331130 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1216331130 is an abundant number, since it is smaller than the sum of its proper divisors (2316150150).

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

1216331130 is a wasteful number, since it uses less digits than its factorization.

1216331130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340743.

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 1216331130 is about 34875.9391271404. The cubic root of 1216331130 is about 1067.4575353272.

Adding to 1216331130 its reverse (311336121), we get a palindrome (1527667251).

The spelling of 1216331130 in words is "one billion, two hundred sixteen million, three hundred thirty-one thousand, one hundred thirty".