1321428700 has 72 divisors (see below), whose sum is σ = 3106957392. Its totient is φ = 485882880.

The previous prime is 1321428697. The next prime is 1321428727. The reversal of 1321428700 is 78241231.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 64062 + ... + 82138.

It is an arithmetic number, because the mean of its divisors is an integer number (43152186).

Almost surely, 2^1321428700 is an apocalyptic number.

1321428700 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1321428700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1553478696).

1321428700 is an abundant number, since it is smaller than the sum of its proper divisors (1785528692).

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

1321428700 is a wasteful number, since it uses less digits than its factorization.

1321428700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18151 (or 18144 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 1321428700 is about 36351.4607684478. The cubic root of 1321428700 is about 1097.3569325913.

Adding to 1321428700 its reverse (78241231), we get a palindrome (1399669931).

It can be divided in two parts, 13214 and 28700, that added together give a palindrome (41914).

The spelling of 1321428700 in words is "one billion, three hundred twenty-one million, four hundred twenty-eight thousand, seven hundred".