123420020513 has 16 divisors (see below), whose sum is σ = 124694519040. Its totient is φ = 122153121216.

The previous prime is 123420020489. The next prime is 123420020531. The reversal of 123420020513 is 315020024321.

It is a cyclic number.

It is not a de Polignac number, because 123420020513 - 2¹² = 123420016417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123420020543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48266231 + ... + 48268787.

It is an arithmetic number, because the mean of its divisors is an integer number (7793407440).

Almost surely, 2^123420020513 is an apocalyptic number.

It is an amenable number.

123420020513 is a deficient number, since it is larger than the sum of its proper divisors (1274498527).

123420020513 is a wasteful number, since it uses less digits than its factorization.

123420020513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3856.

The product of its (nonzero) digits is 1440, while the sum is 23.

Adding to 123420020513 its reverse (315020024321), we get a palindrome (438440044834).

The spelling of 123420020513 in words is "one hundred twenty-three billion, four hundred twenty million, twenty thousand, five hundred thirteen".