123512020540521 has 8 divisors (see below), whose sum is σ = 164742995307744. Its totient is φ = 82311196400160.

The previous prime is 123512020540481. The next prime is 123512020540613. The reversal of 123512020540521 is 125045020215321.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 123512020540521 - 2⁶ = 123512020540457 is a prime.

It is not an unprimeable number, because it can be changed into a prime (123512020540721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7537647156 + ... + 7537663541.

It is an arithmetic number, because the mean of its divisors is an integer number (20592874413468).

Almost surely, 2^{123512020540521} is an apocalyptic number.

It is an amenable number.

123512020540521 is a deficient number, since it is larger than the sum of its proper divisors (41230974767223).

123512020540521 is a wasteful number, since it uses less digits than its factorization.

123512020540521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15075313431.

The product of its (nonzero) digits is 24000, while the sum is 33.

Adding to 123512020540521 its reverse (125045020215321), we get a palindrome (248557040755842).

The spelling of 123512020540521 in words is "one hundred twenty-three trillion, five hundred twelve billion, twenty million, five hundred forty thousand, five hundred twenty-one".