30045236821 has 4 divisors (see below), whose sum is σ = 31081279500. Its totient is φ = 29009194144.

The previous prime is 30045236783. The next prime is 30045236849. The reversal of 30045236821 is 12863254003.

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 14838894225 + 15206342596 = 121815^2 + 123314^2 .

It is a cyclic number.

It is not a de Polignac number, because 30045236821 - 2¹¹ = 30045234773 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 (30045236861) 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, 518021296 + ... + 518021353.

It is an arithmetic number, because the mean of its divisors is an integer number (7770319875).

Almost surely, 2^30045236821 is an apocalyptic number.

It is an amenable number.

30045236821 is a deficient number, since it is larger than the sum of its proper divisors (1036042679).

30045236821 is a wasteful number, since it uses less digits than its factorization.

30045236821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1036042678.

The product of its (nonzero) digits is 34560, while the sum is 34.

The spelling of 30045236821 in words is "thirty billion, forty-five million, two hundred thirty-six thousand, eight hundred twenty-one".