1321003103420 has 288 divisors, whose sum is σ = 3916075935744. Its totient is φ = 363542699520.

The previous prime is 1321003103383. The next prime is 1321003103461. The reversal of 1321003103420 is 243013001231.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 1321003103392 and 1321003103401.

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 95 ways as a sum of consecutive naturals, for example, 4934657 + ... + 5195463.

It is an arithmetic number, because the mean of its divisors is an integer number (13597485888).

Almost surely, 2^{1321003103420} is an apocalyptic number.

1321003103420 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 1321003103420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1958037967872).

1321003103420 is an abundant number, since it is smaller than the sum of its proper divisors (2595072832324).

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

1321003103420 is a wasteful number, since it uses less digits than its factorization.

1321003103420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260881 (or 260868 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 1321003103420 its reverse (243013001231), we get a palindrome (1564016104651).

The spelling of 1321003103420 in words is "one trillion, three hundred twenty-one billion, three million, one hundred three thousand, four hundred twenty".