121145321 has 12 divisors (see below), whose sum is σ = 133762356. Its totient is φ = 109633920.

The previous prime is 121145317. The next prime is 121145341. The reversal of 121145321 is 123541121.

It can be written as a sum of positive squares in 2 ways, for example, as 43705321 + 77440000 = 6611^2 + 8800^2 .

It is not a de Polignac number, because 121145321 - 2² = 121145317 is a prime.

It is a super-3 number, since 3×121145321³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121145293 and 121145302.

It is not an unprimeable number, because it can be changed into a prime (121145341) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26045 + ... + 30341.

It is an arithmetic number, because the mean of its divisors is an integer number (11146863).

Almost surely, 2^121145321 is an apocalyptic number.

121145321 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121145321 is a deficient number, since it is larger than the sum of its proper divisors (12617035).

121145321 is a wasteful number, since it uses less digits than its factorization.

121145321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4552 (or 4541 counting only the distinct ones).

The product of its digits is 240, while the sum is 20.

The square root of 121145321 is about 11006.6035178887. The cubic root of 121145321 is about 494.8066734757.

Adding to 121145321 its reverse (123541121), we get a palindrome (244686442).

The spelling of 121145321 in words is "one hundred twenty-one million, one hundred forty-five thousand, three hundred twenty-one".