402002431123123 has 4 divisors (see below), whose sum is σ = 402073094238520. Its totient is φ = 401931768007728.

The previous prime is 402002431123043. The next prime is 402002431123127. The reversal of 402002431123123 is 321321134200204.

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 402002431123123 - 2⁴⁵ = 366818059034291 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 402002431123091 and 402002431123100.

It is not an unprimeable number, because it can be changed into a prime (402002431123127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35331549165 + ... + 35331560542.

It is an arithmetic number, because the mean of its divisors is an integer number (100518273559630).

Almost surely, 2^{402002431123123} is an apocalyptic number.

402002431123123 is a deficient number, since it is larger than the sum of its proper divisors (70663115397).

402002431123123 is an equidigital number, since it uses as much as digits as its factorization.

402002431123123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70663115396.

The product of its (nonzero) digits is 6912, while the sum is 28.

Adding to 402002431123123 its reverse (321321134200204), we get a palindrome (723323565323327).

The spelling of 402002431123123 in words is "four hundred two trillion, two billion, four hundred thirty-one million, one hundred twenty-three thousand, one hundred twenty-three".