30290240821 has 4 divisors (see below), whose sum is σ = 30324780172. Its totient is φ = 30255701472.

The previous prime is 30290240803. The next prime is 30290240861. The reversal of 30290240821 is 12804209203.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12804209203 = 5879 ⋅2177957.

It can be written as a sum of positive squares in 2 ways, for example, as 9353597796 + 20936643025 = 96714^2 + 144695^2 .

It is a cyclic number.

It is not a de Polignac number, because 30290240821 - 2⁵ = 30290240789 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 (30290240861) 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, 17268360 + ... + 17270113.

It is an arithmetic number, because the mean of its divisors is an integer number (7581195043).

Almost surely, 2^30290240821 is an apocalyptic number.

It is an amenable number.

30290240821 is a deficient number, since it is larger than the sum of its proper divisors (34539351).

30290240821 is an equidigital number, since it uses as much as digits as its factorization.

30290240821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34539350.

The product of its (nonzero) digits is 6912, while the sum is 31.

The spelling of 30290240821 in words is "thirty billion, two hundred ninety million, two hundred forty thousand, eight hundred twenty-one".