123021533145 has 32 divisors (see below), whose sum is σ = 228641437440. Its totient is φ = 55316471040.

The previous prime is 123021533119. The next prime is 123021533179. The reversal of 123021533145 is 541335120321.

It is not a de Polignac number, because 123021533145 - 2¹⁷ = 123021402073 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9597150 + ... + 9609959.

It is an arithmetic number, because the mean of its divisors is an integer number (7145044920).

Almost surely, 2^123021533145 is an apocalyptic number.

123021533145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

123021533145 is a deficient number, since it is larger than the sum of its proper divisors (105619904295).

123021533145 is a wasteful number, since it uses less digits than its factorization.

123021533145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19207185.

The product of its (nonzero) digits is 10800, while the sum is 30.

Adding to 123021533145 its reverse (541335120321), we get a palindrome (664356653466).

The spelling of 123021533145 in words is "one hundred twenty-three billion, twenty-one million, five hundred thirty-three thousand, one hundred forty-five".