50721 has 16 divisors (see below), whose sum is σ = 77760. Its totient is φ = 29120.

The previous prime is 50707. The next prime is 50723. The reversal of 50721 is 12705.

It is a happy number.

50721 is a nontrivial binomial coefficient, being equal to C(319, 2).

It is a cyclic number.

It is not a de Polignac number, because 50721 - 2⁷ = 50593 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a plaindrome in base 14.

It is a nialpdrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 50721.

It is not an unprimeable number, because it can be changed into a prime (50723) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 931 + ... + 983.

It is an arithmetic number, because the mean of its divisors is an integer number (4860).

2⁵⁰⁷²¹ is an apocalyptic number.

50721 is the 318-th triangular number.

It is an amenable number.

50721 is a deficient number, since it is larger than the sum of its proper divisors (27039).

50721 is a wasteful number, since it uses less digits than its factorization.

50721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96.

The product of its (nonzero) digits is 70, while the sum is 15.

The square root of 50721 is about 225.2132322933. The cubic root of 50721 is about 37.0165496940.

It can be divided in two parts, 507 and 21, that added together give a triangular number (528 = T₃₂).

The spelling of 50721 in words is "fifty thousand, seven hundred twenty-one".