1311202220 has 12 divisors (see below), whose sum is σ = 2753524704. Its totient is φ = 524480880.

The previous prime is 1311202199. The next prime is 1311202247. The reversal of 1311202220 is 222021131.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1311202195 and 1311202204.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32780036 + ... + 32780075.

It is an arithmetic number, because the mean of its divisors is an integer number (229460392).

Almost surely, 2^1311202220 is an apocalyptic number.

1311202220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1311202220 is an abundant number, since it is smaller than the sum of its proper divisors (1442322484).

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

1311202220 is a wasteful number, since it uses less digits than its factorization.

1311202220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65560120 (or 65560118 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 1311202220 is about 36210.5263701040. The cubic root of 1311202220 is about 1094.5187991509.

Adding to 1311202220 its reverse (222021131), we get a palindrome (1533223351).

The spelling of 1311202220 in words is "one billion, three hundred eleven million, two hundred two thousand, two hundred twenty".