12251015221 has 2 divisors, whose sum is σ = 12251015222. Its totient is φ = 12251015220.

The previous prime is 12251015213. The next prime is 12251015237.

It is a happy number.

12251015221 is nontrivially palindromic in base 10.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7458222321 + 4792792900 = 86361^2 + 69230^2 .

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 12251015221 - 2³ = 12251015213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12251015192 and 12251015201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12251015261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6125507610 + 6125507611.

It is an arithmetic number, because the mean of its divisors is an integer number (6125507611).

Almost surely, 2^12251015221 is an apocalyptic number.

It is an amenable number.

12251015221 is a deficient number, since it is larger than the sum of its proper divisors (1).

12251015221 is an equidigital number, since it uses as much as digits as its factorization.

12251015221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 400, while the sum is 22.

It can be divided in two parts, 122510 and 15221, that added together give a palindrome (137731).

The spelling of 12251015221 in words is "twelve billion, two hundred fifty-one million, fifteen thousand, two hundred twenty-one".