1231421855183 has 16 divisors (see below), whose sum is σ = 1338690671136. Its totient is φ = 1125947433600.

The previous prime is 1231421855177. The next prime is 1231421855233. The reversal of 1231421855183 is 3815581241321.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1231421855183 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231421555183) 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, 13727585 + ... + 13816997.

It is an arithmetic number, because the mean of its divisors is an integer number (83668166946).

Almost surely, 2^{1231421855183} is an apocalyptic number.

1231421855183 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1231421855183 is a deficient number, since it is larger than the sum of its proper divisors (107268815953).

1231421855183 is a wasteful number, since it uses less digits than its factorization.

1231421855183 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99434.

The product of its digits is 230400, while the sum is 44.

The spelling of 1231421855183 in words is "one trillion, two hundred thirty-one billion, four hundred twenty-one million, eight hundred fifty-five thousand, one hundred eighty-three".