1313002421 has 4 divisors (see below), whose sum is σ = 1314381132. Its totient is φ = 1311623712.

The previous prime is 1313002367. The next prime is 1313002423. The reversal of 1313002421 is 1242003131.

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 760987396 + 552015025 = 27586^2 + 23495^2 .

It is a cyclic number.

It is not a de Polignac number, because 1313002421 - 2¹⁸ = 1312740277 is a prime.

It is a super-2 number, since 2×1313002421² = 3447950715103722482, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1313002421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1313002423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 687926 + ... + 689831.

It is an arithmetic number, because the mean of its divisors is an integer number (328595283).

Almost surely, 2^1313002421 is an apocalyptic number.

It is an amenable number.

1313002421 is a deficient number, since it is larger than the sum of its proper divisors (1378711).

1313002421 is an equidigital number, since it uses as much as digits as its factorization.

1313002421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1378710.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 1313002421 is about 36235.3752705833. The cubic root of 1313002421 is about 1095.0194726978.

Adding to 1313002421 its reverse (1242003131), we get a palindrome (2555005552).

The spelling of 1313002421 in words is "one billion, three hundred thirteen million, two thousand, four hundred twenty-one".