1320211220 has 12 divisors (see below), whose sum is σ = 2772443604. Its totient is φ = 528084480.

The previous prime is 1320211187. The next prime is 1320211223. The reversal of 1320211220 is 221120231.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 356605456 + 963605764 = 18884^2 + 31042^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1320211195 and 1320211204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320211223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33005261 + ... + 33005300.

It is an arithmetic number, because the mean of its divisors is an integer number (231036967).

Almost surely, 2^1320211220 is an apocalyptic number.

1320211220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1320211220 is an abundant number, since it is smaller than the sum of its proper divisors (1452232384).

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

1320211220 is a wasteful number, since it uses less digits than its factorization.

1320211220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66010570 (or 66010568 counting only the distinct ones).

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

The square root of 1320211220 is about 36334.7109524763. The cubic root of 1320211220 is about 1097.0198175094.

Adding to 1320211220 its reverse (221120231), we get a palindrome (1541331451).

The spelling of 1320211220 in words is "one billion, three hundred twenty million, two hundred eleven thousand, two hundred twenty".