30278090021 has 2 divisors, whose sum is σ = 30278090022. Its totient is φ = 30278090020.

The previous prime is 30278089999. The next prime is 30278090033. The reversal of 30278090021 is 12009087203.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29920350625 + 357739396 = 172975^2 + 18914^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30278090021 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 30278090021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30278090081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15139045010 + 15139045011.

It is an arithmetic number, because the mean of its divisors is an integer number (15139045011).

Almost surely, 2^30278090021 is an apocalyptic number.

It is an amenable number.

30278090021 is a deficient number, since it is larger than the sum of its proper divisors (1).

30278090021 is an equidigital number, since it uses as much as digits as its factorization.

30278090021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 32.

The spelling of 30278090021 in words is "thirty billion, two hundred seventy-eight million, ninety thousand, twenty-one".