121245643 has 4 divisors (see below), whose sum is σ = 121393080. Its totient is φ = 121098208.

The previous prime is 121245637. The next prime is 121245697. The reversal of 121245643 is 346542121.

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

It is a cyclic number.

It is not a de Polignac number, because 121245643 - 2¹⁷ = 121114571 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121245623) 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, 72478 + ... + 74131.

It is an arithmetic number, because the mean of its divisors is an integer number (30348270).

Almost surely, 2^121245643 is an apocalyptic number.

121245643 is a deficient number, since it is larger than the sum of its proper divisors (147437).

121245643 is an equidigital number, since it uses as much as digits as its factorization.

121245643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147436.

The product of its digits is 5760, while the sum is 28.

The square root of 121245643 is about 11011.1599298167. The cubic root of 121245643 is about 494.9432210492.

Adding to 121245643 its reverse (346542121), we get a palindrome (467787764).

The spelling of 121245643 in words is "one hundred twenty-one million, two hundred forty-five thousand, six hundred forty-three".