51052043021 has 24 divisors (see below), whose sum is σ = 60897566520. Its totient is φ = 42648076800.

The previous prime is 51052042999. The next prime is 51052043023. The reversal of 51052043021 is 12034025015.

It can be written as a sum of positive squares in 4 ways, for example, as 2206180900 + 48845862121 = 46970^2 + 221011^2 .

It is a de Polignac number, because none of the positive numbers 2^k-51052043021 is a prime.

It is a super-2 number, since 2×51052043021² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51052043023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2038745 + ... + 2063633.

It is an arithmetic number, because the mean of its divisors is an integer number (2537398605).

Almost surely, 2^51052043021 is an apocalyptic number.

It is an amenable number.

51052043021 is a deficient number, since it is larger than the sum of its proper divisors (9845523499).

51052043021 is a wasteful number, since it uses less digits than its factorization.

51052043021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25965 (or 25958 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 23.

Adding to 51052043021 its reverse (12034025015), we get a palindrome (63086068036).

The spelling of 51052043021 in words is "fifty-one billion, fifty-two million, forty-three thousand, twenty-one".