121920971 has 2 divisors, whose sum is σ = 121920972. Its totient is φ = 121920970.

The previous prime is 121920947. The next prime is 121920979. The reversal of 121920971 is 179029121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121920971 - 2²² = 117726667 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (121920979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60960485 + 60960486.

It is an arithmetic number, because the mean of its divisors is an integer number (60960486).

Almost surely, 2^121920971 is an apocalyptic number.

121920971 is a deficient number, since it is larger than the sum of its proper divisors (1).

121920971 is an equidigital number, since it uses as much as digits as its factorization.

121920971 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2268, while the sum is 32.

The square root of 121920971 is about 11041.7829629096. The cubic root of 121920971 is about 495.8604508453.

The spelling of 121920971 in words is "one hundred twenty-one million, nine hundred twenty thousand, nine hundred seventy-one".