30252778021 has 2 divisors, whose sum is σ = 30252778022. Its totient is φ = 30252778020.

The previous prime is 30252777923. The next prime is 30252778033. The reversal of 30252778021 is 12087725203.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22576565025 + 7676212996 = 150255^2 + 87614^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30252778021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30252778081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15126389010 + 15126389011.

It is an arithmetic number, because the mean of its divisors is an integer number (15126389011).

Almost surely, 2^30252778021 is an apocalyptic number.

It is an amenable number.

30252778021 is a deficient number, since it is larger than the sum of its proper divisors (1).

30252778021 is an equidigital number, since it uses as much as digits as its factorization.

30252778021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 47040, while the sum is 37.

The spelling of 30252778021 in words is "thirty billion, two hundred fifty-two million, seven hundred seventy-eight thousand, twenty-one".