50720021 has 4 divisors (see below), whose sum is σ = 55330944. Its totient is φ = 46109100.

The previous prime is 50720011. The next prime is 50720023. The reversal of 50720021 is 12002705.

50720021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 a cyclic number.

It is not a de Polignac number, because 50720021 - 2⁶ = 50719957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (50720023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2305445 + ... + 2305466.

It is an arithmetic number, because the mean of its divisors is an integer number (13832736).

Almost surely, 2^50720021 is an apocalyptic number.

It is an amenable number.

50720021 is a deficient number, since it is larger than the sum of its proper divisors (4610923).

50720021 is a wasteful number, since it uses less digits than its factorization.

50720021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4610922.

The product of its (nonzero) digits is 140, while the sum is 17.

The square root of 50720021 is about 7121.7990002527. The cubic root of 50720021 is about 370.1631153210.

Adding to 50720021 its reverse (12002705), we get a palindrome (62722726).

The spelling of 50720021 in words is "fifty million, seven hundred twenty thousand, twenty-one".