121751217 has 24 divisors (see below), whose sum is σ = 202582016. Its totient is φ = 69019776.

The previous prime is 121751209. The next prime is 121751233. The reversal of 121751217 is 712157121.

It is not a de Polignac number, because 121751217 - 2³ = 121751209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121751207) 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 in 23 ways as a sum of consecutive naturals, for example, 393 + ... + 15609.

Almost surely, 2^121751217 is an apocalyptic number.

It is an amenable number.

121751217 is a deficient number, since it is larger than the sum of its proper divisors (80830799).

121751217 is a wasteful number, since it uses less digits than its factorization.

121751217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15357 (or 15354 counting only the distinct ones).

The product of its digits is 980, while the sum is 27.

The square root of 121751217 is about 11034.0933927532. The cubic root of 121751217 is about 495.6302104674.

The spelling of 121751217 in words is "one hundred twenty-one million, seven hundred fifty-one thousand, two hundred seventeen".