65216921 has 8 divisors (see below), whose sum is σ = 81309504. Its totient is φ = 50818320.

The previous prime is 65216917. The next prime is 65216941. The reversal of 65216921 is 12961256.

It is a happy number.

65216921 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 not a de Polignac number, because 65216921 - 2² = 65216917 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65216941) 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, 423410 + ... + 423563.

It is an arithmetic number, because the mean of its divisors is an integer number (10163688).

Almost surely, 2^65216921 is an apocalyptic number.

It is an amenable number.

65216921 is a deficient number, since it is larger than the sum of its proper divisors (16092583).

65216921 is a wasteful number, since it uses less digits than its factorization.

65216921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 846991.

The product of its digits is 6480, while the sum is 32.

The square root of 65216921 is about 8075.6994124348. The cubic root of 65216921 is about 402.5193509465.

The spelling of 65216921 in words is "sixty-five million, two hundred sixteen thousand, nine hundred twenty-one".