8472912121 has 2 divisors, whose sum is σ = 8472912122. Its totient is φ = 8472912120.

The previous prime is 8472912103. The next prime is 8472912127. The reversal of 8472912121 is 1212192748.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5634153721 + 2838758400 = 75061^2 + 53280^2 .

It is a cyclic number.

It is not a de Polignac number, because 8472912121 - 2⁹ = 8472911609 is a prime.

It is not a weakly prime, because it can be changed into another prime (8472912127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4236456060 + 4236456061.

It is an arithmetic number, because the mean of its divisors is an integer number (4236456061).

Almost surely, 2^8472912121 is an apocalyptic number.

It is an amenable number.

8472912121 is a deficient number, since it is larger than the sum of its proper divisors (1).

8472912121 is an equidigital number, since it uses as much as digits as its factorization.

8472912121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16128, while the sum is 37.

The square root of 8472912121 is about 92048.4226969697. The cubic root of 8472912121 is about 2038.6573345658.

The spelling of 8472912121 in words is "eight billion, four hundred seventy-two million, nine hundred twelve thousand, one hundred twenty-one".