51214521 has 4 divisors (see below), whose sum is σ = 68286032. Its totient is φ = 34143012.

The previous prime is 51214507. The next prime is 51214529. The reversal of 51214521 is 12541215.

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 not a de Polignac number, because 51214521 - 2¹⁰ = 51213497 is a prime.

It is a super-2 number, since 2×51214521² = 5245854322518882, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51214529) 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, 8535751 + ... + 8535756.

It is an arithmetic number, because the mean of its divisors is an integer number (17071508).

Almost surely, 2^51214521 is an apocalyptic number.

It is an amenable number.

51214521 is a deficient number, since it is larger than the sum of its proper divisors (17071511).

51214521 is a wasteful number, since it uses less digits than its factorization.

51214521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17071510.

The product of its digits is 400, while the sum is 21.

The square root of 51214521 is about 7156.4321417869. The cubic root of 51214521 is about 371.3622078039.

Adding to 51214521 its reverse (12541215), we get a palindrome (63755736).

The spelling of 51214521 in words is "fifty-one million, two hundred fourteen thousand, five hundred twenty-one".