12355131621 has 16 divisors (see below), whose sum is σ = 18962316800. Its totient is φ = 7009281648.

The previous prime is 12355131589. The next prime is 12355131629. The reversal of 12355131621 is 12613155321.

It is not a de Polignac number, because 12355131621 - 2⁵ = 12355131589 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12355131629) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2113411 + ... + 2119248.

It is an arithmetic number, because the mean of its divisors is an integer number (1185144800).

Almost surely, 2^12355131621 is an apocalyptic number.

It is an amenable number.

12355131621 is a deficient number, since it is larger than the sum of its proper divisors (6607185179).

12355131621 is a wasteful number, since it uses less digits than its factorization.

12355131621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4232808.

The product of its digits is 5400, while the sum is 30.

Adding to 12355131621 its reverse (12613155321), we get a palindrome (24968286942).

The spelling of 12355131621 in words is "twelve billion, three hundred fifty-five million, one hundred thirty-one thousand, six hundred twenty-one".