1321021002013 has 4 divisors (see below), whose sum is σ = 1321070040988. Its totient is φ = 1320971963040.

The previous prime is 1321021002001. The next prime is 1321021002019. The reversal of 1321021002013 is 3102001201231.

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 861625784644 + 459395217369 = 928238^2 + 677787^2 .

It is a cyclic number.

It is not a de Polignac number, because 1321021002013 - 2⁹ = 1321021001501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321021002019) 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, 24479058 + ... + 24532963.

It is an arithmetic number, because the mean of its divisors is an integer number (330267510247).

Almost surely, 2^{1321021002013} is an apocalyptic number.

It is an amenable number.

1321021002013 is a deficient number, since it is larger than the sum of its proper divisors (49038975).

1321021002013 is an equidigital number, since it uses as much as digits as its factorization.

1321021002013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49038974.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 1321021002013 its reverse (3102001201231), we get a palindrome (4423022203244).

The spelling of 1321021002013 in words is "one trillion, three hundred twenty-one billion, twenty-one million, two thousand, thirteen".