1321403340 has 24 divisors (see below), whose sum is σ = 3699929520. Its totient is φ = 352374208.

The previous prime is 1321403339. The next prime is 1321403341. The reversal of 1321403340 is 433041231.

It is an interprime number because it is at equal distance from previous prime (1321403339) and next prime (1321403341).

It is a super-2 number, since 2×1321403340² = 3492213573926311200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1321403341) 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, 11011635 + ... + 11011754.

It is an arithmetic number, because the mean of its divisors is an integer number (154163730).

Almost surely, 2^1321403340 is an apocalyptic number.

1321403340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1321403340 is an abundant number, since it is smaller than the sum of its proper divisors (2378526180).

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

1321403340 is a wasteful number, since it uses less digits than its factorization.

1321403340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22023401 (or 22023399 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 1321403340 is about 36351.1119499803. Note that the first 3 decimals coincide. The cubic root of 1321403340 is about 1097.3499126262.

Adding to 1321403340 its reverse (433041231), we get a palindrome (1754444571).

The spelling of 1321403340 in words is "one billion, three hundred twenty-one million, four hundred three thousand, three hundred forty".