51021071 has 8 divisors (see below), whose sum is σ = 53532288. Its totient is φ = 48564000.

The previous prime is 51021053. The next prime is 51021077. The reversal of 51021071 is 17012015.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51021071 - 2⁶ = 51021007 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51021077) 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 7 ways as a sum of consecutive naturals, for example, 11600 + ... + 15381.

It is an arithmetic number, because the mean of its divisors is an integer number (6691536).

Almost surely, 2^51021071 is an apocalyptic number.

51021071 is a deficient number, since it is larger than the sum of its proper divisors (2511217).

51021071 is a wasteful number, since it uses less digits than its factorization.

51021071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27073.

The product of its (nonzero) digits is 70, while the sum is 17.

The square root of 51021071 is about 7142.9035412779. The cubic root of 51021071 is about 370.8940420016.

Adding to 51021071 its reverse (17012015), we get a palindrome (68033086).

The spelling of 51021071 in words is "fifty-one million, twenty-one thousand, seventy-one".