121722871 has 2 divisors, whose sum is σ = 121722872. Its totient is φ = 121722870.

The previous prime is 121722869. The next prime is 121722893. The reversal of 121722871 is 178227121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121722871 - 2¹ = 121722869 is a prime.

Together with 121722869, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121722851) 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, 60861435 + 60861436.

It is an arithmetic number, because the mean of its divisors is an integer number (60861436).

Almost surely, 2^121722871 is an apocalyptic number.

121722871 is a deficient number, since it is larger than the sum of its proper divisors (1).

121722871 is an equidigital number, since it uses as much as digits as its factorization.

121722871 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3136, while the sum is 31.

The square root of 121722871 is about 11032.8088445327. The cubic root of 121722871 is about 495.5917434340.

Adding to 121722871 its reverse (178227121), we get a palindrome (299949992).

The spelling of 121722871 in words is "one hundred twenty-one million, seven hundred twenty-two thousand, eight hundred seventy-one".