121680557 has 8 divisors (see below), whose sum is σ = 127106496. Its totient is φ = 116265952.

The previous prime is 121680551. The next prime is 121680563. The reversal of 121680557 is 755086121.

It is an interprime number because it is at equal distance from previous prime (121680551) and next prime (121680563).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121680557 - 2²⁰ = 120631981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121680551) 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 7 ways as a sum of consecutive naturals, for example, 25073 + ... + 29529.

It is an arithmetic number, because the mean of its divisors is an integer number (15888312).

Almost surely, 2^121680557 is an apocalyptic number.

It is an amenable number.

121680557 is a deficient number, since it is larger than the sum of its proper divisors (5425939).

121680557 is a wasteful number, since it uses less digits than its factorization.

121680557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5667.

The product of its (nonzero) digits is 16800, while the sum is 35.

The square root of 121680557 is about 11030.8910338195. The cubic root of 121680557 is about 495.5343099671.

The spelling of 121680557 in words is "one hundred twenty-one million, six hundred eighty thousand, five hundred fifty-seven".