1020013321 has 4 divisors (see below), whose sum is σ = 1020247444. Its totient is φ = 1019779200.

The previous prime is 1020013307. The next prime is 1020013369. The reversal of 1020013321 is 1233100201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1233100201 = 29023 ⋅42487.

It can be written as a sum of positive squares in 2 ways, for example, as 602015296 + 417998025 = 24536^2 + 20445^2 .

It is a cyclic number.

It is not a de Polignac number, because 1020013321 - 2⁵ = 1020013289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1020013301) 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, 110400 + ... + 119281.

It is an arithmetic number, because the mean of its divisors is an integer number (255061861).

Almost surely, 2^1020013321 is an apocalyptic number.

It is an amenable number.

1020013321 is a deficient number, since it is larger than the sum of its proper divisors (234123).

1020013321 is an equidigital number, since it uses as much as digits as its factorization.

1020013321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234122.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 1020013321 is about 31937.6473930063. The cubic root of 1020013321 is about 1006.6270916394.

Adding to 1020013321 its reverse (1233100201), we get a palindrome (2253113522).

The spelling of 1020013321 in words is "one billion, twenty million, thirteen thousand, three hundred twenty-one".