12251215221 has 32 divisors (see below), whose sum is σ = 19409510400. Its totient is φ = 6726075840.

The previous prime is 12251215201. The next prime is 12251215231.

12251215221 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 12251215221 - 2⁶ = 12251215157 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12251215191 and 12251215200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12251215201) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22795 + ... + 158183.

It is an arithmetic number, because the mean of its divisors is an integer number (606547200).

Almost surely, 2^12251215221 is an apocalyptic number.

It is an amenable number.

12251215221 is a deficient number, since it is larger than the sum of its proper divisors (7158295179).

12251215221 is a wasteful number, since it uses less digits than its factorization.

12251215221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135569.

The product of its digits is 800, while the sum is 24.

The spelling of 12251215221 in words is "twelve billion, two hundred fifty-one million, two hundred fifteen thousand, two hundred twenty-one".