65112821 has 4 divisors (see below), whose sum is σ = 65142912. Its totient is φ = 65082732.

The previous prime is 65112809. The next prime is 65112833. The reversal of 65112821 is 12821156.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (65112809) and next prime (65112833).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65112821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65112841) 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, 11525 + ... + 16218.

It is an arithmetic number, because the mean of its divisors is an integer number (16285728).

Almost surely, 2^65112821 is an apocalyptic number.

It is an amenable number.

65112821 is a deficient number, since it is larger than the sum of its proper divisors (30091).

65112821 is a wasteful number, since it uses less digits than its factorization.

65112821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30090.

The product of its digits is 960, while the sum is 26.

The square root of 65112821 is about 8069.2515761996. The cubic root of 65112821 is about 402.3050682187.

Adding to 65112821 its reverse (12821156), we get a palindrome (77933977).

The spelling of 65112821 in words is "sixty-five million, one hundred twelve thousand, eight hundred twenty-one".