121620871 has 2 divisors, whose sum is σ = 121620872. Its totient is φ = 121620870.

The previous prime is 121620869. The next prime is 121620893. The reversal of 121620871 is 178026121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121620871 - 2¹ = 121620869 is a prime.

Together with 121620869, 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 (121620841) 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, 60810435 + 60810436.

It is an arithmetic number, because the mean of its divisors is an integer number (60810436).

Almost surely, 2^121620871 is an apocalyptic number.

121620871 is a deficient number, since it is larger than the sum of its proper divisors (1).

121620871 is an equidigital number, since it uses as much as digits as its factorization.

121620871 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1344, while the sum is 28.

The square root of 121620871 is about 11028.1852994951. The cubic root of 121620871 is about 495.4532745665.

Adding to 121620871 its reverse (178026121), we get a palindrome (299646992).

The spelling of 121620871 in words is "one hundred twenty-one million, six hundred twenty thousand, eight hundred seventy-one".