121934821 has 8 divisors (see below), whose sum is σ = 128521080. Its totient is φ = 115507392.

The previous prime is 121934809. The next prime is 121934833. The reversal of 121934821 is 128439121.

It is an interprime number because it is at equal distance from previous prime (121934809) and next prime (121934833).

It can be written as a sum of positive squares in 4 ways, for example, as 27941796 + 93993025 = 5286^2 + 9695^2 .

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 121934821 - 2⁵ = 121934789 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 (121934851) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38130 + ... + 41203.

It is an arithmetic number, because the mean of its divisors is an integer number (16065135).

Almost surely, 2^121934821 is an apocalyptic number.

It is an amenable number.

121934821 is a deficient number, since it is larger than the sum of its proper divisors (6586259).

121934821 is an equidigital number, since it uses as much as digits as its factorization.

121934821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79415.

The product of its digits is 3456, while the sum is 31.

The square root of 121934821 is about 11042.4101083052. The cubic root of 121934821 is about 495.8792264154.

The spelling of 121934821 in words is "one hundred twenty-one million, nine hundred thirty-four thousand, eight hundred twenty-one".