51021442530 has 24 divisors (see below), whose sum is σ = 132655750812. Its totient is φ = 13605717984.

The previous prime is 51021442487. The next prime is 51021442579. The reversal of 51021442530 is 3524412015.

51021442530 is a `hidden beast` number, since 510 + 2 + 144 + 2 + 5 + 3 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 46719525609 + 4301916921 = 216147^2 + 65589^2 .

It is a junction number, because it is equal to n+sod(n) for n = 51021442494 and 51021442503.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 283452369 + ... + 283452548.

Almost surely, 2^51021442530 is an apocalyptic number.

51021442530 is an abundant number, since it is smaller than the sum of its proper divisors (81634308282).

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

51021442530 is a wasteful number, since it uses less digits than its factorization.

51021442530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 566904930 (or 566904927 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

Adding to 51021442530 its reverse (3524412015), we get a palindrome (54545854545).

The spelling of 51021442530 in words is "fifty-one billion, twenty-one million, four hundred forty-two thousand, five hundred thirty".