1220311312 has 40 divisors (see below), whose sum is σ = 2588709312. Its totient is φ = 552662400.

The previous prime is 1220311291. The next prime is 1220311327. The reversal of 1220311312 is 2131130221.

It is a super-2 number, since 2×1220311312² = 2978319396390322688, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36237 + ... + 61267.

Almost surely, 2^1220311312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1220311312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1294354656).

1220311312 is an abundant number, since it is smaller than the sum of its proper divisors (1368398000).

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

1220311312 is a wasteful number, since it uses less digits than its factorization.

1220311312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25327 (or 25321 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1220311312 is about 34932.9545272083. The cubic root of 1220311312 is about 1068.6206093394.

Adding to 1220311312 its reverse (2131130221), we get a palindrome (3351441533).

The spelling of 1220311312 in words is "one billion, two hundred twenty million, three hundred eleven thousand, three hundred twelve".