30121355393 has 2 divisors, whose sum is σ = 30121355394. Its totient is φ = 30121355392.

The previous prime is 30121355353. The next prime is 30121355471. The reversal of 30121355393 is 39355312103.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23260215169 + 6861140224 = 152513^2 + 82832^2 .

It is a cyclic number.

It is not a de Polignac number, because 30121355393 - 2¹² = 30121351297 is a prime.

It is a super-2 number, since 2×30121355393² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (30121355353) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15060677696 + 15060677697.

It is an arithmetic number, because the mean of its divisors is an integer number (15060677697).

Almost surely, 2^30121355393 is an apocalyptic number.

It is an amenable number.

30121355393 is a deficient number, since it is larger than the sum of its proper divisors (1).

30121355393 is an equidigital number, since it uses as much as digits as its factorization.

30121355393 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36450, while the sum is 35.

Adding to 30121355393 its reverse (39355312103), we get a palindrome (69476667496).

The spelling of 30121355393 in words is "thirty billion, one hundred twenty-one million, three hundred fifty-five thousand, three hundred ninety-three".