65032021 has 4 divisors (see below), whose sum is σ = 68857452. Its totient is φ = 61206592.

The previous prime is 65032013. The next prime is 65032031. The reversal of 65032021 is 12023056.

It is a happy number.

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 53129521 + 11902500 = 7289^2 + 3450^2 .

It is a cyclic number.

It is not a de Polignac number, because 65032021 - 2³ = 65032013 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 65032021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65032031) 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, 1912690 + ... + 1912723.

It is an arithmetic number, because the mean of its divisors is an integer number (17214363).

Almost surely, 2^65032021 is an apocalyptic number.

It is an amenable number.

65032021 is a deficient number, since it is larger than the sum of its proper divisors (3825431).

65032021 is a wasteful number, since it uses less digits than its factorization.

65032021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3825430.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 65032021 is about 8064.2433619032. The cubic root of 65032021 is about 402.1385894608.

Adding to 65032021 its reverse (12023056), we get a palindrome (77055077).

The spelling of 65032021 in words is "sixty-five million, thirty-two thousand, twenty-one".