121726917 has 24 divisors (see below), whose sum is σ = 191246328. Its totient is φ = 74160000.

The previous prime is 121726897. The next prime is 121726921. The reversal of 121726917 is 719627121.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 60746436 + 60980481 = 7794^2 + 7809^2 .

It is not a de Polignac number, because 121726917 - 2⁷ = 121726789 is a prime.

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121721917) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6667 + ... + 16967.

It is an arithmetic number, because the mean of its divisors is an integer number (7968597).

Almost surely, 2^121726917 is an apocalyptic number.

It is an amenable number.

121726917 is a deficient number, since it is larger than the sum of its proper divisors (69519411).

121726917 is a wasteful number, since it uses less digits than its factorization.

121726917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10421 (or 10418 counting only the distinct ones).

The product of its digits is 10584, while the sum is 36.

The square root of 121726917 is about 11032.9922051998. The cubic root of 121726917 is about 495.5972344371.

The spelling of 121726917 in words is "one hundred twenty-one million, seven hundred twenty-six thousand, nine hundred seventeen".