121835281 has 4 divisors (see below), whose sum is σ = 122047012. Its totient is φ = 121623552.

The previous prime is 121835257. The next prime is 121835309. The reversal of 121835281 is 182538121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 182538121 = 293 ⋅622997.

It can be written as a sum of positive squares in 2 ways, for example, as 119246400 + 2588881 = 10920^2 + 1609^2 .

It is a cyclic number.

It is not a de Polignac number, because 121835281 - 2⁵ = 121835249 is a prime.

It is a super-2 number, since 2×121835281² = 29687671392697922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121835251) 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, 105000 + ... + 106153.

It is an arithmetic number, because the mean of its divisors is an integer number (30511753).

Almost surely, 2^121835281 is an apocalyptic number.

It is an amenable number.

121835281 is a deficient number, since it is larger than the sum of its proper divisors (211731).

121835281 is an equidigital number, since it uses as much as digits as its factorization.

121835281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211730.

The product of its digits is 3840, while the sum is 31.

The square root of 121835281 is about 11037.9020198587. The cubic root of 121835281 is about 495.7442547004.

The spelling of 121835281 in words is "one hundred twenty-one million, eight hundred thirty-five thousand, two hundred eighty-one".