30207444821 has 4 divisors (see below), whose sum is σ = 30410179500. Its totient is φ = 30004710144.

The previous prime is 30207444811. The next prime is 30207444851. The reversal of 30207444821 is 12844470203.

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

It can be written as a sum of positive squares in 2 ways, for example, as 12442287025 + 17765157796 = 111545^2 + 133286^2 .

It is a cyclic number.

It is not a de Polignac number, because 30207444821 - 2²⁶ = 30140335957 is a prime.

It is a super-2 number, since 2×30207444821² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30207444811) 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, 101367116 + ... + 101367413.

It is an arithmetic number, because the mean of its divisors is an integer number (7602544875).

Almost surely, 2^30207444821 is an apocalyptic number.

It is an amenable number.

30207444821 is a deficient number, since it is larger than the sum of its proper divisors (202734679).

30207444821 is a wasteful number, since it uses less digits than its factorization.

30207444821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202734678.

The product of its (nonzero) digits is 43008, while the sum is 35.

The spelling of 30207444821 in words is "thirty billion, two hundred seven million, four hundred forty-four thousand, eight hundred twenty-one".