51430353021 has 12 divisors (see below), whose sum is σ = 76849953180. Its totient is φ = 33104594880.

The previous prime is 51430353019. The next prime is 51430353047. The reversal of 51430353021 is 12035303415.

51430353021 is a `hidden beast` number, since 51 + 4 + 303 + 5 + 302 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 32931360900 + 18498992121 = 181470^2 + 136011^2 .

It is not a de Polignac number, because 51430353021 - 2¹ = 51430353019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51430353721) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 98525320 + ... + 98525841.

It is an arithmetic number, because the mean of its divisors is an integer number (6404162765).

Almost surely, 2^51430353021 is an apocalyptic number.

It is an amenable number.

51430353021 is a deficient number, since it is larger than the sum of its proper divisors (25419600159).

51430353021 is a wasteful number, since it uses less digits than its factorization.

51430353021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197051196 (or 197051193 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 27.

Adding to 51430353021 its reverse (12035303415), we get a palindrome (63465656436).

The spelling of 51430353021 in words is "fifty-one billion, four hundred thirty million, three hundred fifty-three thousand, twenty-one".