121478399971 has 2 divisors, whose sum is σ = 121478399972. Its totient is φ = 121478399970.

The previous prime is 121478399921. The next prime is 121478400011. The reversal of 121478399971 is 179993874121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121478399971 - 2³³ = 112888465379 is a prime.

It is not a weakly prime, because it can be changed into another prime (121478399921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60739199985 + 60739199986.

It is an arithmetic number, because the mean of its divisors is an integer number (60739199986).

Almost surely, 2^121478399971 is an apocalyptic number.

121478399971 is a deficient number, since it is larger than the sum of its proper divisors (1).

121478399971 is an equidigital number, since it uses as much as digits as its factorization.

121478399971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6858432, while the sum is 61.

The spelling of 121478399971 in words is "one hundred twenty-one billion, four hundred seventy-eight million, three hundred ninety-nine thousand, nine hundred seventy-one".