1321821430 has 16 divisors (see below), whose sum is σ = 2379695760. Its totient is φ = 528635872.

The previous prime is 1321821409. The next prime is 1321821437. The reversal of 1321821430 is 341281231.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1321821395 and 1321821404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321821437) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 94872 + ... + 107908.

It is an arithmetic number, because the mean of its divisors is an integer number (148730985).

Almost surely, 2^1321821430 is an apocalyptic number.

1321821430 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1321821430 is a deficient number, since it is larger than the sum of its proper divisors (1057874330).

1321821430 is a wasteful number, since it uses less digits than its factorization.

1321821430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23183.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 1321821430 is about 36356.8622133429. The cubic root of 1321821430 is about 1097.4656337016.

The spelling of 1321821430 in words is "one billion, three hundred twenty-one million, eight hundred twenty-one thousand, four hundred thirty".