12251500221 has 4 divisors (see below), whose sum is σ = 16335333632. Its totient is φ = 8167666812.

The previous prime is 12251500201. The next prime is 12251500237. The reversal of 12251500221 is 12200515221.

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 not a de Polignac number, because 12251500221 - 2⁹ = 12251499709 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 (12251500201) 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, 2041916701 + ... + 2041916706.

It is an arithmetic number, because the mean of its divisors is an integer number (4083833408).

Almost surely, 2^12251500221 is an apocalyptic number.

It is an amenable number.

12251500221 is a deficient number, since it is larger than the sum of its proper divisors (4083833411).

12251500221 is an equidigital number, since it uses as much as digits as its factorization.

12251500221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4083833410.

The product of its (nonzero) digits is 400, while the sum is 21.

The spelling of 12251500221 in words is "twelve billion, two hundred fifty-one million, five hundred thousand, two hundred twenty-one".