65021231 has 8 divisors (see below), whose sum is σ = 71186304. Its totient is φ = 58898520.

The previous prime is 65021183. The next prime is 65021237. The reversal of 65021231 is 13212056.

65021231 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 65021231 - 2¹⁴ = 65004847 is a prime.

It is a super-2 number, since 2×65021231² = 8455520961510722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65021237) 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 7 ways as a sum of consecutive naturals, for example, 7331 + ... + 13556.

It is an arithmetic number, because the mean of its divisors is an integer number (8898288).

Almost surely, 2^65021231 is an apocalyptic number.

65021231 is a deficient number, since it is larger than the sum of its proper divisors (6165073).

65021231 is a wasteful number, since it uses less digits than its factorization.

65021231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21181.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 65021231 is about 8063.5743315232. The cubic root of 65021231 is about 402.1163475184.

Adding to 65021231 its reverse (13212056), we get a palindrome (78233287).

The spelling of 65021231 in words is "sixty-five million, twenty-one thousand, two hundred thirty-one".