51124821 has 16 divisors (see below), whose sum is σ = 74500608. Its totient is φ = 30927600.

The previous prime is 51124793. The next prime is 51124823. The reversal of 51124821 is 12842115.

It is not a de Polignac number, because 51124821 - 2¹⁰ = 51123797 is a prime.

It is a super-2 number, since 2×51124821² = 5227494644564082, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51124791 and 51124800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51124823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22926 + ... + 25056.

It is an arithmetic number, because the mean of its divisors is an integer number (4656288).

Almost surely, 2^51124821 is an apocalyptic number.

It is an amenable number.

51124821 is a deficient number, since it is larger than the sum of its proper divisors (23375787).

51124821 is a wasteful number, since it uses less digits than its factorization.

51124821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2872.

The product of its digits is 640, while the sum is 24.

The square root of 51124821 is about 7150.1623058501. The cubic root of 51124821 is about 371.1452728667.

Adding to 51124821 its reverse (12842115), we get a palindrome (63966936).

The spelling of 51124821 in words is "fifty-one million, one hundred twenty-four thousand, eight hundred twenty-one".