1321413220 has 24 divisors (see below), whose sum is σ = 2839503744. Its totient is φ = 516272736.

The previous prime is 1321413211. The next prime is 1321413221. The reversal of 1321413220 is 223141231.

It is a happy number.

It is a super-2 number, since 2×1321413220² = 3492265795981536800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1321413221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 767404 + ... + 769123.

It is an arithmetic number, because the mean of its divisors is an integer number (118312656).

Almost surely, 2^1321413220 is an apocalyptic number.

1321413220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1321413220 is an abundant number, since it is smaller than the sum of its proper divisors (1518090524).

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

1321413220 is a wasteful number, since it uses less digits than its factorization.

1321413220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1536579 (or 1536577 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 1321413220 is about 36351.2478465320. The cubic root of 1321413220 is about 1097.3526475444.

Adding to 1321413220 its reverse (223141231), we get a palindrome (1544554451).

The spelling of 1321413220 in words is "one billion, three hundred twenty-one million, four hundred thirteen thousand, two hundred twenty".