30242120021 has 2 divisors, whose sum is σ = 30242120022. Its totient is φ = 30242120020.

The previous prime is 30242119987. The next prime is 30242120023. The reversal of 30242120021 is 12002124203.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25633611025 + 4608508996 = 160105^2 + 67886^2 .

It is a cyclic number.

It is not a de Polignac number, because 30242120021 - 2²² = 30237925717 is a prime.

It is a Sophie Germain prime.

Together with 30242120023, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30242120023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15121060010 + 15121060011.

It is an arithmetic number, because the mean of its divisors is an integer number (15121060011).

Almost surely, 2^30242120021 is an apocalyptic number.

It is an amenable number.

30242120021 is a deficient number, since it is larger than the sum of its proper divisors (1).

30242120021 is an equidigital number, since it uses as much as digits as its factorization.

30242120021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 30242120021 its reverse (12002124203), we get a palindrome (42244244224).

The spelling of 30242120021 in words is "thirty billion, two hundred forty-two million, one hundred twenty thousand, twenty-one".