51021030 has 64 divisors (see below), whose sum is σ = 125737920. Its totient is φ = 13246464.

The previous prime is 51021011. The next prime is 51021037. The reversal of 51021030 is 3012015.

It is a junction number, because it is equal to n+sod(n) for n = 51020997 and 51021015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51021037) 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 31 ways as a sum of consecutive naturals, for example, 258892 + ... + 259088.

It is an arithmetic number, because the mean of its divisors is an integer number (1964655).

Almost surely, 2^51021030 is an apocalyptic number.

51021030 is an abundant number, since it is smaller than the sum of its proper divisors (74716890).

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

51021030 is a wasteful number, since it uses less digits than its factorization.

51021030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 393.

The product of its (nonzero) digits is 30, while the sum is 12.

The square root of 51021030 is about 7142.9006712959. The cubic root of 51021030 is about 370.8939426527.

Adding to 51021030 its reverse (3012015), we get a palindrome (54033045).

The spelling of 51021030 in words is "fifty-one million, twenty-one thousand, thirty".