60021721 has 4 divisors (see below), whose sum is σ = 60074932. Its totient is φ = 59968512.

The previous prime is 60021719. The next prime is 60021737. The reversal of 60021721 is 12712006.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12712006 = 2 ⋅6356003.

It can be written as a sum of positive squares in 2 ways, for example, as 45091225 + 14930496 = 6715^2 + 3864^2 .

It is a cyclic number.

It is not a de Polignac number, because 60021721 - 2¹ = 60021719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (60021121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24876 + ... + 27181.

It is an arithmetic number, because the mean of its divisors is an integer number (15018733).

Almost surely, 2^60021721 is an apocalyptic number.

It is an amenable number.

60021721 is a deficient number, since it is larger than the sum of its proper divisors (53211).

60021721 is a wasteful number, since it uses less digits than its factorization.

60021721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53210.

The product of its (nonzero) digits is 168, while the sum is 19.

The square root of 60021721 is about 7747.3686500644. The cubic root of 60021721 is about 391.5339999951.

Adding to 60021721 its reverse (12712006), we get a palindrome (72733727).

The spelling of 60021721 in words is "sixty million, twenty-one thousand, seven hundred twenty-one".