121724101 has 2 divisors, whose sum is σ = 121724102. Its totient is φ = 121724100.

The previous prime is 121724087. The next prime is 121724123. The reversal of 121724101 is 101427121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 116661601 + 5062500 = 10801^2 + 2250^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121724101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121721101) 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, 60862050 + 60862051.

It is an arithmetic number, because the mean of its divisors is an integer number (60862051).

Almost surely, 2^121724101 is an apocalyptic number.

It is an amenable number.

121724101 is a deficient number, since it is larger than the sum of its proper divisors (1).

121724101 is an equidigital number, since it uses as much as digits as its factorization.

121724101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 112, while the sum is 19.

The square root of 121724101 is about 11032.8645872230. The cubic root of 121724101 is about 495.5934127335.

The spelling of 121724101 in words is "one hundred twenty-one million, seven hundred twenty-four thousand, one hundred one".