65021243 has 12 divisors (see below), whose sum is σ = 78940752. Its totient is φ = 52452480.

The previous prime is 65021239. The next prime is 65021261. The reversal of 65021243 is 34212056.

65021243 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 65021243 - 2² = 65021239 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65021273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14048 + ... + 18093.

It is an arithmetic number, because the mean of its divisors is an integer number (6578396).

Almost surely, 2^65021243 is an apocalyptic number.

65021243 is a deficient number, since it is larger than the sum of its proper divisors (13919509).

65021243 is a wasteful number, since it uses less digits than its factorization.

65021243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32182 (or 32165 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 65021243 is about 8063.5750756101. The cubic root of 65021243 is about 402.1163722560.

Adding to 65021243 its reverse (34212056), we get a palindrome (99233299).

The spelling of 65021243 in words is "sixty-five million, twenty-one thousand, two hundred forty-three".