65111421 has 8 divisors (see below), whose sum is σ = 87791040. Its totient is φ = 42919712.

The previous prime is 65111419. The next prime is 65111437. The reversal of 65111421 is 12411156.

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 65111421 - 2¹ = 65111419 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65111441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 121665 + ... + 122198.

It is an arithmetic number, because the mean of its divisors is an integer number (10973880).

Almost surely, 2^65111421 is an apocalyptic number.

It is an amenable number.

65111421 is a deficient number, since it is larger than the sum of its proper divisors (22679619).

65111421 is a wasteful number, since it uses less digits than its factorization.

65111421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243955.

The product of its digits is 240, while the sum is 21.

The square root of 65111421 is about 8069.1648266720. The cubic root of 65111421 is about 402.3021848586.

Adding to 65111421 its reverse (12411156), we get a palindrome (77522577).

The spelling of 65111421 in words is "sixty-five million, one hundred eleven thousand, four hundred twenty-one".