121643123 has 16 divisors (see below), whose sum is σ = 141657600. Its totient is φ = 102301056.

The previous prime is 121643099. The next prime is 121643131. The reversal of 121643123 is 321346121.

It is a cyclic number.

It is not a de Polignac number, because 121643123 - 2⁸ = 121642867 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121643323) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 202778 + ... + 203376.

It is an arithmetic number, because the mean of its divisors is an integer number (8853600).

Almost surely, 2^121643123 is an apocalyptic number.

121643123 is a deficient number, since it is larger than the sum of its proper divisors (20014477).

121643123 is an equidigital number, since it uses as much as digits as its factorization.

121643123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1106.

The product of its digits is 864, while the sum is 23.

The square root of 121643123 is about 11029.1941228723. The cubic root of 121643123 is about 495.4834891009.

Adding to 121643123 its reverse (321346121), we get a palindrome (442989244).

The spelling of 121643123 in words is "one hundred twenty-one million, six hundred forty-three thousand, one hundred twenty-three".