121043221 has 4 divisors (see below), whose sum is σ = 130354252. Its totient is φ = 111732192.

The previous prime is 121043191. The next prime is 121043239. The reversal of 121043221 is 122340121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5244100 + 115799121 = 2290^2 + 10761^2 .

It is a de Polignac number, because none of the positive numbers 2^k-121043221 is a prime.

It is a super-2 number, since 2×121043221² = 29302922700109682, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121043195 and 121043204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121043921) 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, 4655496 + ... + 4655521.

It is an arithmetic number, because the mean of its divisors is an integer number (32588563).

Almost surely, 2^121043221 is an apocalyptic number.

It is an amenable number.

121043221 is a deficient number, since it is larger than the sum of its proper divisors (9311031).

121043221 is an equidigital number, since it uses as much as digits as its factorization.

121043221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9311030.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 121043221 is about 11001.9644155033. The cubic root of 121043221 is about 494.6676284563.

Adding to 121043221 its reverse (122340121), we get a palindrome (243383342).

The spelling of 121043221 in words is "one hundred twenty-one million, forty-three thousand, two hundred twenty-one".