121538843 has 4 divisors (see below), whose sum is σ = 122343888. Its totient is φ = 120733800.

The previous prime is 121538827. The next prime is 121538863. The reversal of 121538843 is 348835121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 348835121 = 17 ⋅20519713.

It is a cyclic number.

It is not a de Polignac number, because 121538843 - 2⁴ = 121538827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121538863) 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, 402296 + ... + 402597.

It is an arithmetic number, because the mean of its divisors is an integer number (30585972).

Almost surely, 2^121538843 is an apocalyptic number.

121538843 is a deficient number, since it is larger than the sum of its proper divisors (805045).

121538843 is an equidigital number, since it uses as much as digits as its factorization.

121538843 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 805044.

The product of its digits is 23040, while the sum is 35.

The square root of 121538843 is about 11024.4656559853. The cubic root of 121538843 is about 495.3418622703.

The spelling of 121538843 in words is "one hundred twenty-one million, five hundred thirty-eight thousand, eight hundred forty-three".