320101021 has 4 divisors (see below), whose sum is σ = 322249500. Its totient is φ = 317952544.

The previous prime is 320101013. The next prime is 320101027. The reversal of 320101021 is 120101023.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120101023 = 7 ⋅17157289.

It can be written as a sum of positive squares in 2 ways, for example, as 68244121 + 251856900 = 8261^2 + 15870^2 .

It is a cyclic number.

It is not a de Polignac number, because 320101021 - 2³ = 320101013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 320100989 and 320101007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320101027) 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, 1074016 + ... + 1074313.

It is an arithmetic number, because the mean of its divisors is an integer number (80562375).

Almost surely, 2^320101021 is an apocalyptic number.

It is an amenable number.

320101021 is a deficient number, since it is larger than the sum of its proper divisors (2148479).

320101021 is a wasteful number, since it uses less digits than its factorization.

320101021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2148478.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 320101021 is about 17891.3672199751. The cubic root of 320101021 is about 684.0623475480.

Adding to 320101021 its reverse (120101023), we get a palindrome (440202044).

The spelling of 320101021 in words is "three hundred twenty million, one hundred one thousand, twenty-one".