121043421 has 6 divisors (see below), whose sum is σ = 174840510. Its totient is φ = 80695608.

The previous prime is 121043407. The next prime is 121043423. The reversal of 121043421 is 124340121.

121043421 is a `hidden beast` number, since 1 + 210 + 434 + 21 = 666.

It can be written as a sum of positive squares in only one way, i.e., 101727396 + 19316025 = 10086^2 + 4395^2 .

It is not a de Polignac number, because 121043421 - 2¹⁵ = 121010653 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121043394 and 121043403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121043423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6724626 + ... + 6724643.

It is an arithmetic number, because the mean of its divisors is an integer number (29140085).

Almost surely, 2^121043421 is an apocalyptic number.

It is an amenable number.

121043421 is a deficient number, since it is larger than the sum of its proper divisors (53797089).

121043421 is a wasteful number, since it uses less digits than its factorization.

121043421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13449275 (or 13449272 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 121043421 is about 11001.9735047854. The cubic root of 121043421 is about 494.6679009030.

Adding to 121043421 its reverse (124340121), we get a palindrome (245383542).

The spelling of 121043421 in words is "one hundred twenty-one million, forty-three thousand, four hundred twenty-one".