1321113220 has 24 divisors (see below), whose sum is σ = 3170672064. Its totient is φ = 452953056.

The previous prime is 1321113109. The next prime is 1321113223. The reversal of 1321113220 is 223111231.

It is a junction number, because it is equal to n+sod(n) for n = 1321113194 and 1321113203.

It is not an unprimeable number, because it can be changed into a prime (1321113223) 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, 4718122 + ... + 4718401.

It is an arithmetic number, because the mean of its divisors is an integer number (132111336).

Almost surely, 2^1321113220 is an apocalyptic number.

1321113220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1321113220 is an abundant number, since it is smaller than the sum of its proper divisors (1849558844).

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

1321113220 is a wasteful number, since it uses less digits than its factorization.

1321113220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9436539 (or 9436537 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1321113220 is about 36347.1212065000. The cubic root of 1321113220 is about 1097.2695973914.

Adding to 1321113220 its reverse (223111231), we get a palindrome (1544224451).

The spelling of 1321113220 in words is "one billion, three hundred twenty-one million, one hundred thirteen thousand, two hundred twenty".