121145345 has 4 divisors (see below), whose sum is σ = 145374420. Its totient is φ = 96916272.

The previous prime is 121145341. The next prime is 121145377. The reversal of 121145345 is 543541121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 543541121 = 811 ⋅670211.

It can be written as a sum of positive squares in 2 ways, for example, as 84953089 + 36192256 = 9217^2 + 6016^2 .

It is a cyclic number.

It is not a de Polignac number, because 121145345 - 2² = 121145341 is a prime.

It is a super-3 number, since 3×121145345³ (a number of 25 digits) contains 333 as substring.

It is a Curzon number.

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 3 ways as a sum of consecutive naturals, for example, 12114530 + ... + 12114539.

It is an arithmetic number, because the mean of its divisors is an integer number (36343605).

Almost surely, 2^121145345 is an apocalyptic number.

It is an amenable number.

121145345 is a deficient number, since it is larger than the sum of its proper divisors (24229075).

121145345 is an equidigital number, since it uses as much as digits as its factorization.

121145345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24229074.

The product of its digits is 2400, while the sum is 26.

The square root of 121145345 is about 11006.6046081432. The cubic root of 121145345 is about 494.8067061509.

Adding to 121145345 its reverse (543541121), we get a palindrome (664686466).

The spelling of 121145345 in words is "one hundred twenty-one million, one hundred forty-five thousand, three hundred forty-five".