12551201021 has 4 divisors (see below), whose sum is σ = 12551482944. Its totient is φ = 12550919100.

The previous prime is 12551201011. The next prime is 12551201023. The reversal of 12551201021 is 12010215521.

12551201021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 12551201021 - 2³⁰ = 11477459197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12551200984 and 12551201002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12551201023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57845 + ... + 168666.

It is an arithmetic number, because the mean of its divisors is an integer number (3137870736).

Almost surely, 2^12551201021 is an apocalyptic number.

It is an amenable number.

12551201021 is a deficient number, since it is larger than the sum of its proper divisors (281923).

12551201021 is an equidigital number, since it uses as much as digits as its factorization.

12551201021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281922.

The product of its (nonzero) digits is 200, while the sum is 20.

Adding to 12551201021 its reverse (12010215521), we get a palindrome (24561416542).

The spelling of 12551201021 in words is "twelve billion, five hundred fifty-one million, two hundred one thousand, twenty-one".