121201199971 has 2 divisors, whose sum is σ = 121201199972. Its totient is φ = 121201199970.

The previous prime is 121201199969. The next prime is 121201200007. The reversal of 121201199971 is 179991102121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121201199971 - 2¹ = 121201199969 is a prime.

Together with 121201199969, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (121201199921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60600599985 + 60600599986.

It is an arithmetic number, because the mean of its divisors is an integer number (60600599986).

Almost surely, 2^121201199971 is an apocalyptic number.

121201199971 is a deficient number, since it is larger than the sum of its proper divisors (1).

121201199971 is an equidigital number, since it uses as much as digits as its factorization.

121201199971 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20412, while the sum is 43.

The spelling of 121201199971 in words is "one hundred twenty-one billion, two hundred one million, one hundred ninety-nine thousand, nine hundred seventy-one".