30551246516821 has 2 divisors, whose sum is σ = 30551246516822. Its totient is φ = 30551246516820.

The previous prime is 30551246516789. The next prime is 30551246516831. The reversal of 30551246516821 is 12861564215503.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22330926764721 + 8220319752100 = 4725561^2 + 2867110^2 .

It is a cyclic number.

It is not a de Polignac number, because 30551246516821 - 2⁵ = 30551246516789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30551246516831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15275623258410 + 15275623258411.

It is an arithmetic number, because the mean of its divisors is an integer number (15275623258411).

Almost surely, 2^{30551246516821} is an apocalyptic number.

It is an amenable number.

30551246516821 is a deficient number, since it is larger than the sum of its proper divisors (1).

30551246516821 is an equidigital number, since it uses as much as digits as its factorization.

30551246516821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728000, while the sum is 49.

The spelling of 30551246516821 in words is "thirty trillion, five hundred fifty-one billion, two hundred forty-six million, five hundred sixteen thousand, eight hundred twenty-one".