51021343 has 4 divisors (see below), whose sum is σ = 52265808. Its totient is φ = 49776880.

The previous prime is 51021331. The next prime is 51021391. The reversal of 51021343 is 34312015.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34312015 = 5 ⋅6862403.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51021343 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51021343.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51021323) 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, 622171 + ... + 622252.

It is an arithmetic number, because the mean of its divisors is an integer number (13066452).

Almost surely, 2^51021343 is an apocalyptic number.

51021343 is a deficient number, since it is larger than the sum of its proper divisors (1244465).

51021343 is a wasteful number, since it uses less digits than its factorization.

51021343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1244464.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 51021343 is about 7142.9225811288. The cubic root of 51021343 is about 370.8947010953.

Adding to 51021343 its reverse (34312015), we get a palindrome (85333358).

The spelling of 51021343 in words is "fifty-one million, twenty-one thousand, three hundred forty-three".