30782820121 has 2 divisors, whose sum is σ = 30782820122. Its totient is φ = 30782820120.

The previous prime is 30782820073. The next prime is 30782820161. The reversal of 30782820121 is 12102828703.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18202057225 + 12580762896 = 134915^2 + 112164^2 .

It is a cyclic number.

It is not a de Polignac number, because 30782820121 - 2²⁷ = 30648602393 is a prime.

It is not a weakly prime, because it can be changed into another prime (30782820161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15391410060 + 15391410061.

It is an arithmetic number, because the mean of its divisors is an integer number (15391410061).

Almost surely, 2^30782820121 is an apocalyptic number.

It is an amenable number.

30782820121 is a deficient number, since it is larger than the sum of its proper divisors (1).

30782820121 is an equidigital number, since it uses as much as digits as its factorization.

30782820121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10752, while the sum is 34.

The spelling of 30782820121 in words is "thirty billion, seven hundred eighty-two million, eight hundred twenty thousand, one hundred twenty-one".