1321203040 has 24 divisors (see below), whose sum is σ = 3121342560. Its totient is φ = 528481152.

The previous prime is 1321203029. The next prime is 1321203089. The reversal of 1321203040 is 403021231.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4128600 + ... + 4128919.

It is an arithmetic number, because the mean of its divisors is an integer number (130055940).

Almost surely, 2^1321203040 is an apocalyptic number.

1321203040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1321203040 is an abundant number, since it is smaller than the sum of its proper divisors (1800139520).

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

1321203040 is an equidigital number, since it uses as much as digits as its factorization.

1321203040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8257534 (or 8257526 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 1321203040 is about 36348.3567716616. The cubic root of 1321203040 is about 1097.2944639257.

Adding to 1321203040 its reverse (403021231), we get a palindrome (1724224271).

The spelling of 1321203040 in words is "one billion, three hundred twenty-one million, two hundred three thousand, forty".