12521113445 has 8 divisors (see below), whose sum is σ = 15909179544. Its totient is φ = 9427661824.

The previous prime is 12521113439. The next prime is 12521113447. The reversal of 12521113445 is 54431112521.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3968748004 + 8552365441 = 62998^2 + 92479^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 12521113445 - 2¹⁰ = 12521112421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12521113447) 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, 73653524 + ... + 73653693.

It is an arithmetic number, because the mean of its divisors is an integer number (1988647443).

Almost surely, 2^12521113445 is an apocalyptic number.

It is an amenable number.

12521113445 is a deficient number, since it is larger than the sum of its proper divisors (3388066099).

12521113445 is a wasteful number, since it uses less digits than its factorization.

12521113445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147307239.

The product of its digits is 4800, while the sum is 29.

Adding to 12521113445 its reverse (54431112521), we get a palindrome (66952225966).

The spelling of 12521113445 in words is "twelve billion, five hundred twenty-one million, one hundred thirteen thousand, four hundred forty-five".