12506021191 has 2 divisors, whose sum is σ = 12506021192. Its totient is φ = 12506021190.

The previous prime is 12506021131. The next prime is 12506021197. The reversal of 12506021191 is 19112060521.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12506021191 - 2¹¹ = 12506019143 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12506021197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6253010595 + 6253010596.

It is an arithmetic number, because the mean of its divisors is an integer number (6253010596).

Almost surely, 2^12506021191 is an apocalyptic number.

12506021191 is a deficient number, since it is larger than the sum of its proper divisors (1).

12506021191 is an equidigital number, since it uses as much as digits as its factorization.

12506021191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 28.

The spelling of 12506021191 in words is "twelve billion, five hundred six million, twenty-one thousand, one hundred ninety-one".