12534522121 has 4 divisors (see below), whose sum is σ = 13674024144. Its totient is φ = 11395020100.

The previous prime is 12534522107. The next prime is 12534522139. The reversal of 12534522121 is 12122543521.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12534522121 - 2⁵ = 12534522089 is a prime.

It is a super-2 number, since 2×12534522121² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 12534522121.

It is not an unprimeable number, because it can be changed into a prime (12534522191) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 569750995 + ... + 569751016.

It is an arithmetic number, because the mean of its divisors is an integer number (3418506036).

Almost surely, 2^12534522121 is an apocalyptic number.

12534522121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12534522121 is a deficient number, since it is larger than the sum of its proper divisors (1139502023).

12534522121 is a wasteful number, since it uses less digits than its factorization.

12534522121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1139502022.

The product of its digits is 4800, while the sum is 28.

The spelling of 12534522121 in words is "twelve billion, five hundred thirty-four million, five hundred twenty-two thousand, one hundred twenty-one".