121680829 has 4 divisors (see below), whose sum is σ = 121744476. Its totient is φ = 121617184.

The previous prime is 121680821. The next prime is 121680851. The reversal of 121680829 is 928086121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 928086121 = 6037 ⋅153733.

It can be written as a sum of positive squares in 2 ways, for example, as 83265625 + 38415204 = 9125^2 + 6198^2 .

It is a cyclic number.

It is not a de Polignac number, because 121680829 - 2³ = 121680821 is a prime.

It is a super-2 number, since 2×121680829² = 29612448292254482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121680821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28864 + ... + 32809.

It is an arithmetic number, because the mean of its divisors is an integer number (30436119).

Almost surely, 2^121680829 is an apocalyptic number.

It is an amenable number.

121680829 is a deficient number, since it is larger than the sum of its proper divisors (63647).

121680829 is an equidigital number, since it uses as much as digits as its factorization.

121680829 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63646.

The product of its (nonzero) digits is 13824, while the sum is 37.

The square root of 121680829 is about 11030.9033628257. The cubic root of 121680829 is about 495.5346791995.

The spelling of 121680829 in words is "one hundred twenty-one million, six hundred eighty thousand, eight hundred twenty-nine".