1231421251191 has 16 divisors (see below), whose sum is σ = 1676937368064. Its totient is φ = 803428576704.

The previous prime is 1231421251163. The next prime is 1231421251237. The reversal of 1231421251191 is 1911521241321.

It is not a de Polignac number, because 1231421251191 - 2⁹ = 1231421250679 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231421251891) 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, 1969320 + ... + 2518146.

It is an arithmetic number, because the mean of its divisors is an integer number (104808585504).

Almost surely, 2^{1231421251191} is an apocalyptic number.

1231421251191 is a deficient number, since it is larger than the sum of its proper divisors (445516116873).

1231421251191 is a wasteful number, since it uses less digits than its factorization.

1231421251191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 564790.

The product of its digits is 4320, while the sum is 33.

The spelling of 1231421251191 in words is "one trillion, two hundred thirty-one billion, four hundred twenty-one million, two hundred fifty-one thousand, one hundred ninety-one".