123021012545 has 4 divisors (see below), whose sum is σ = 147625215060. Its totient is φ = 98416810032.

The previous prime is 123021012503. The next prime is 123021012563. The reversal of 123021012545 is 545210120321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 545210120321 = 298373 ⋅1827277.

It can be written as a sum of positive squares in 2 ways, for example, as 28740081841 + 94280930704 = 169529^2 + 307052^2 .

It is a cyclic number.

It is not a de Polignac number, because 123021012545 - 2⁶ = 123021012481 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12302101250 + ... + 12302101259.

It is an arithmetic number, because the mean of its divisors is an integer number (36906303765).

Almost surely, 2^123021012545 is an apocalyptic number.

It is an amenable number.

123021012545 is a deficient number, since it is larger than the sum of its proper divisors (24604202515).

123021012545 is an equidigital number, since it uses as much as digits as its factorization.

123021012545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24604202514.

The product of its (nonzero) digits is 2400, while the sum is 26.

Adding to 123021012545 its reverse (545210120321), we get a palindrome (668231132866).

The spelling of 123021012545 in words is "one hundred twenty-three billion, twenty-one million, twelve thousand, five hundred forty-five".