51041021 has 4 divisors (see below), whose sum is σ = 54043452. Its totient is φ = 48038592.

The previous prime is 51040999. The next prime is 51041027. The reversal of 51041021 is 12014015.

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

It can be written as a sum of positive squares in 2 ways, for example, as 15100996 + 35940025 = 3886^2 + 5995^2 .

It is a cyclic number.

It is not a de Polignac number, because 51041021 - 2¹⁸ = 50778877 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51040987 and 51041005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51041027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1501190 + ... + 1501223.

It is an arithmetic number, because the mean of its divisors is an integer number (13510863).

Almost surely, 2^51041021 is an apocalyptic number.

It is an amenable number.

51041021 is a deficient number, since it is larger than the sum of its proper divisors (3002431).

51041021 is a wasteful number, since it uses less digits than its factorization.

51041021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3002430.

The product of its (nonzero) digits is 40, while the sum is 14.

The square root of 51041021 is about 7144.2998957211. The cubic root of 51041021 is about 370.9423774036.

Adding to 51041021 its reverse (12014015), we get a palindrome (63055036).

The spelling of 51041021 in words is "fifty-one million, forty-one thousand, twenty-one".