123143021 has 4 divisors (see below), whose sum is σ = 123293472. Its totient is φ = 122992572.

The previous prime is 123143017. The next prime is 123143023. The reversal of 123143021 is 120341321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 123143021 - 2² = 123143017 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123143023) 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, 73991 + ... + 75636.

It is an arithmetic number, because the mean of its divisors is an integer number (30823368).

Almost surely, 2^123143021 is an apocalyptic number.

It is an amenable number.

123143021 is a deficient number, since it is larger than the sum of its proper divisors (150451).

123143021 is an equidigital number, since it uses as much as digits as its factorization.

123143021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150450.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 123143021 is about 11096.9825177838. The cubic root of 123143021 is about 497.5116649201.

Adding to 123143021 its reverse (120341321), we get a palindrome (243484342).

The spelling of 123143021 in words is "one hundred twenty-three million, one hundred forty-three thousand, twenty-one".