1311022220 has 24 divisors (see below), whose sum is σ = 2770689264. Its totient is φ = 521067456.

The previous prime is 1311022217. The next prime is 1311022247. The reversal of 1311022220 is 222201131.

It is a happy number.

It is a super-2 number, since 2×1311022220² = 3437558522667456800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1311022195 and 1311022204.

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, 205622 + ... + 211901.

It is an arithmetic number, because the mean of its divisors is an integer number (115445386).

Almost surely, 2^1311022220 is an apocalyptic number.

1311022220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1311022220 is an abundant number, since it is smaller than the sum of its proper divisors (1459667044).

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

1311022220 is a wasteful number, since it uses less digits than its factorization.

1311022220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 417689 (or 417687 counting only the distinct ones).

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

The square root of 1311022220 is about 36208.0408196853. The cubic root of 1311022220 is about 1094.4687121908.

Adding to 1311022220 its reverse (222201131), we get a palindrome (1533223351).

The spelling of 1311022220 in words is "one billion, three hundred eleven million, twenty-two thousand, two hundred twenty".