51021363 has 4 divisors (see below), whose sum is σ = 68028488. Its totient is φ = 34014240.

The previous prime is 51021331. The next prime is 51021391. The reversal of 51021363 is 36312015.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 51021363 - 2⁵ = 51021331 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51021323) 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 3 ways as a sum of consecutive naturals, for example, 8503558 + ... + 8503563.

It is an arithmetic number, because the mean of its divisors is an integer number (17007122).

Almost surely, 2^51021363 is an apocalyptic number.

51021363 is a deficient number, since it is larger than the sum of its proper divisors (17007125).

51021363 is a wasteful number, since it uses less digits than its factorization.

51021363 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17007124.

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 51021363 is about 7142.9239811159. The cubic root of 51021363 is about 370.8947495580.

Adding to 51021363 its reverse (36312015), we get a palindrome (87333378).

The spelling of 51021363 in words is "fifty-one million, twenty-one thousand, three hundred sixty-three".