1321420013 has 8 divisors (see below), whose sum is σ = 1402908408. Its totient is φ = 1240349184.

The previous prime is 1321420007. The next prime is 1321420027. The reversal of 1321420013 is 3100241231.

It can be written as a sum of positive squares in 4 ways, for example, as 498762889 + 822657124 = 22333^2 + 28682^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1321420013 - 2⁶ = 1321419949 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1321419973 and 1321420000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321420073) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 97856 + ... + 110537.

It is an arithmetic number, because the mean of its divisors is an integer number (175363551).

Almost surely, 2^1321420013 is an apocalyptic number.

It is an amenable number.

1321420013 is a deficient number, since it is larger than the sum of its proper divisors (81488395).

1321420013 is a wasteful number, since it uses less digits than its factorization.

1321420013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208783.

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

The square root of 1321420013 is about 36351.3412819940. The cubic root of 1321420013 is about 1097.3545279312.

Adding to 1321420013 its reverse (3100241231), we get a palindrome (4421661244).

The spelling of 1321420013 in words is "one billion, three hundred twenty-one million, four hundred twenty thousand, thirteen".