51043021 has 4 divisors (see below), whose sum is σ = 52230112. Its totient is φ = 49855932.

The previous prime is 51043009. The next prime is 51043033. The reversal of 51043021 is 12034015.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (51043009) and next prime (51043033).

It is a cyclic number.

It is not a de Polignac number, because 51043021 - 2¹⁹ = 50518733 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51042986 and 51043004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51043001) 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, 593481 + ... + 593566.

It is an arithmetic number, because the mean of its divisors is an integer number (13057528).

Almost surely, 2^51043021 is an apocalyptic number.

It is an amenable number.

51043021 is a deficient number, since it is larger than the sum of its proper divisors (1187091).

51043021 is a wasteful number, since it uses less digits than its factorization.

51043021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1187090.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 51043021 is about 7144.4398660777. The cubic root of 51043021 is about 370.9472223633.

Adding to 51043021 its reverse (12034015), we get a palindrome (63077036).

The spelling of 51043021 in words is "fifty-one million, forty-three thousand, twenty-one".