51221024 has 24 divisors (see below), whose sum is σ = 103569228. Its totient is φ = 24917760.

The previous prime is 51220999. The next prime is 51221057. The reversal of 51221024 is 42012215.

It can be written as a sum of positive squares in 2 ways, for example, as 48052624 + 3168400 = 6932^2 + 1780^2 .

It is a junction number, because it is equal to n+sod(n) for n = 51220993 and 51221011.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20447 + ... + 22814.

Almost surely, 2^51221024 is an apocalyptic number.

It is an amenable number.

51221024 is an abundant number, since it is smaller than the sum of its proper divisors (52348204).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51221024 is a wasteful number, since it uses less digits than its factorization.

51221024 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43308 (or 43300 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 51221024 is about 7156.8864738795. The cubic root of 51221024 is about 371.3779251316.

Adding to 51221024 its reverse (42012215), we get a palindrome (93233239).

The spelling of 51221024 in words is "fifty-one million, two hundred twenty-one thousand, twenty-four".