51021043 has 4 divisors (see below), whose sum is σ = 51089200. Its totient is φ = 50952888.

The previous prime is 51021041. The next prime is 51021053. The reversal of 51021043 is 34012015.

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

It is a cyclic number.

It is not a de Polignac number, because 51021043 - 2¹ = 51021041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51021041) 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, 32943 + ... + 34456.

It is an arithmetic number, because the mean of its divisors is an integer number (12772300).

Almost surely, 2^51021043 is an apocalyptic number.

51021043 is a deficient number, since it is larger than the sum of its proper divisors (68157).

51021043 is an equidigital number, since it uses as much as digits as its factorization.

51021043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68156.

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

The square root of 51021043 is about 7142.9015812903. The cubic root of 51021043 is about 370.8939741536.

Adding to 51021043 its reverse (34012015), we get a palindrome (85033058).

Subtracting from 51021043 its reverse (34012015), we obtain a triangular number (17009028 = T₅₈₃₂).

The spelling of 51021043 in words is "fifty-one million, twenty-one thousand, forty-three".