1321323043420 has 96 divisors (see below), whose sum is σ = 2841326449920. Its totient is φ = 516039828480.

The previous prime is 1321323043409. The next prime is 1321323043441. The reversal of 1321323043420 is 243403231231.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 48420180 + ... + 48447460.

It is an arithmetic number, because the mean of its divisors is an integer number (29597150520).

Almost surely, 2^{1321323043420} is an apocalyptic number.

1321323043420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1321323043420 is an abundant number, since it is smaller than the sum of its proper divisors (1520003406500).

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

1321323043420 is a wasteful number, since it uses less digits than its factorization.

1321323043420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27715 (or 27713 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 28.

Adding to 1321323043420 its reverse (243403231231), we get a palindrome (1564726274651).

The spelling of 1321323043420 in words is "one trillion, three hundred twenty-one billion, three hundred twenty-three million, forty-three thousand, four hundred twenty".