65212521 has 32 divisors (see below), whose sum is σ = 99809280. Its totient is φ = 37488000.

The previous prime is 65212487. The next prime is 65212549. The reversal of 65212521 is 12521256.

It is a happy number.

It is not a de Polignac number, because 65212521 - 2⁶ = 65212457 is a prime.

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

It is a junction number, because it is equal to n+sod(n) for n = 65212491 and 65212500.

It is not an unprimeable number, because it can be changed into a prime (65212621) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 114325 + ... + 114893.

It is an arithmetic number, because the mean of its divisors is an integer number (3119040).

Almost surely, 2^65212521 is an apocalyptic number.

It is an amenable number.

65212521 is a deficient number, since it is larger than the sum of its proper divisors (34596759).

65212521 is a wasteful number, since it uses less digits than its factorization.

65212521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 757.

The product of its digits is 1200, while the sum is 24.

The square root of 65212521 is about 8075.4269856151. The cubic root of 65212521 is about 402.5102984647.

Adding to 65212521 its reverse (12521256), we get a palindrome (77733777).

The spelling of 65212521 in words is "sixty-five million, two hundred twelve thousand, five hundred twenty-one".