121208947 has 2 divisors, whose sum is σ = 121208948. Its totient is φ = 121208946.

The previous prime is 121208939. The next prime is 121208953. The reversal of 121208947 is 749802121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121208947 - 2³ = 121208939 is a prime.

It is a zygodrome in base 2.

It is not a weakly prime, because it can be changed into another prime (121208917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60604473 + 60604474.

It is an arithmetic number, because the mean of its divisors is an integer number (60604474).

Almost surely, 2^121208947 is an apocalyptic number.

121208947 is a deficient number, since it is larger than the sum of its proper divisors (1).

121208947 is an equidigital number, since it uses as much as digits as its factorization.

121208947 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064, while the sum is 34.

The square root of 121208947 is about 11009.4934942530. The cubic root of 121208947 is about 494.8932831198.

It can be divided in two parts, 121208 and 947, that multiplied together give a triangular number (114783976 = T₁₅₁₅₁).

The spelling of 121208947 in words is "one hundred twenty-one million, two hundred eight thousand, nine hundred forty-seven".