16240420123 has 4 divisors (see below), whose sum is σ = 16800434640. Its totient is φ = 15680405608.

The previous prime is 16240420103. The next prime is 16240420187. The reversal of 16240420123 is 32102404261.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32102404261 = 23 ⋅1395756707.

It is a cyclic number.

It is not a de Polignac number, because 16240420123 - 2¹³ = 16240411931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16240420103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 280007215 + ... + 280007272.

It is an arithmetic number, because the mean of its divisors is an integer number (4200108660).

Almost surely, 2^16240420123 is an apocalyptic number.

16240420123 is a deficient number, since it is larger than the sum of its proper divisors (560014517).

16240420123 is an equidigital number, since it uses as much as digits as its factorization.

16240420123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 560014516.

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 16240420123 its reverse (32102404261), we get a palindrome (48342824384).

The spelling of 16240420123 in words is "sixteen billion, two hundred forty million, four hundred twenty thousand, one hundred twenty-three".