12891209901 has 16 divisors (see below), whose sum is σ = 18054389760. Its totient is φ = 8166034800.

The previous prime is 12891209857. The next prime is 12891209909. The reversal of 12891209901 is 10990219821.

It is not a de Polignac number, because 12891209901 - 2⁹ = 12891209389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12891209909) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 608221 + ... + 629058.

It is an arithmetic number, because the mean of its divisors is an integer number (1128399360).

Almost surely, 2^12891209901 is an apocalyptic number.

It is an amenable number.

12891209901 is a deficient number, since it is larger than the sum of its proper divisors (5163179859).

12891209901 is a wasteful number, since it uses less digits than its factorization.

12891209901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1237456.

The product of its (nonzero) digits is 23328, while the sum is 42.

The spelling of 12891209901 in words is "twelve billion, eight hundred ninety-one million, two hundred nine thousand, nine hundred one".