1331003002421 has 4 divisors (see below), whose sum is σ = 1331036426700. Its totient is φ = 1330969578144.

The previous prime is 1331003002391. The next prime is 1331003002423. The reversal of 1331003002421 is 1242003001331.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 776143380100 + 554859622321 = 880990^2 + 744889^2 .

It is a cyclic number.

It is not a de Polignac number, because 1331003002421 - 2¹⁴ = 1331002986037 is a prime.

It is a super-2 number, since 2×1331003002421² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1331003002393 and 1331003002402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1331003002423) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 16652336 + ... + 16732073.

It is an arithmetic number, because the mean of its divisors is an integer number (332759106675).

Almost surely, 2^{1331003002421} is an apocalyptic number.

It is an amenable number.

1331003002421 is a deficient number, since it is larger than the sum of its proper divisors (33424279).

1331003002421 is an equidigital number, since it uses as much as digits as its factorization.

1331003002421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33424278.

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

Adding to 1331003002421 its reverse (1242003001331), we get a palindrome (2573006003752).

The spelling of 1331003002421 in words is "one trillion, three hundred thirty-one billion, three million, two thousand, four hundred twenty-one".