1020806321 has 4 divisors (see below), whose sum is σ = 1033728000. Its totient is φ = 1007884644.

The previous prime is 1020806287. The next prime is 1020806329. The reversal of 1020806321 is 1236080201.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1020806321 - 2²² = 1016612017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1020806329) 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, 6460721 + ... + 6460878.

It is an arithmetic number, because the mean of its divisors is an integer number (258432000).

Almost surely, 2^1020806321 is an apocalyptic number.

It is an amenable number.

1020806321 is a deficient number, since it is larger than the sum of its proper divisors (12921679).

1020806321 is an equidigital number, since it uses as much as digits as its factorization.

1020806321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12921678.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 1020806321 is about 31950.0597965012. The cubic root of 1020806321 is about 1006.8878883994.

Adding to 1020806321 its reverse (1236080201), we get a palindrome (2256886522).

The spelling of 1020806321 in words is "one billion, twenty million, eight hundred six thousand, three hundred twenty-one".