1213362220 has 48 divisors (see below), whose sum is σ = 2929989888. Its totient is φ = 413449920.

The previous prime is 1213362209. The next prime is 1213362223. The reversal of 1213362220 is 222633121.

It is a junction number, because it is equal to n+sod(n) for n = 1213362191 and 1213362200.

It is not an unprimeable number, because it can be changed into a prime (1213362223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3766 + ... + 49405.

It is an arithmetic number, because the mean of its divisors is an integer number (61041456).

Almost surely, 2^1213362220 is an apocalyptic number.

1213362220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1213362220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1464994944).

1213362220 is an abundant number, since it is smaller than the sum of its proper divisors (1716627668).

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

1213362220 is a wasteful number, since it uses less digits than its factorization.

1213362220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53350 (or 53348 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 1213362220 is about 34833.3492503951. The cubic root of 1213362220 is about 1066.5883182471.

Adding to 1213362220 its reverse (222633121), we get a palindrome (1435995341).

The spelling of 1213362220 in words is "one billion, two hundred thirteen million, three hundred sixty-two thousand, two hundred twenty".