1231421855185 has 8 divisors (see below), whose sum is σ = 1479583875456. Its totient is φ = 983885718000.

The previous prime is 1231421855177. The next prime is 1231421855233. The reversal of 1231421855185 is 5815581241321.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1231421855185 - 2³ = 1231421855177 is a prime.

It is a super-2 number, since 2×1231421855185² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 156466441 + ... + 156474310.

It is an arithmetic number, because the mean of its divisors is an integer number (184947984432).

Almost surely, 2^{1231421855185} is an apocalyptic number.

It is an amenable number.

1231421855185 is a deficient number, since it is larger than the sum of its proper divisors (248162020271).

1231421855185 is an equidigital number, since it uses as much as digits as its factorization.

1231421855185 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312941543.

The product of its digits is 384000, while the sum is 46.

The spelling of 1231421855185 in words is "one trillion, two hundred thirty-one billion, four hundred twenty-one million, eight hundred fifty-five thousand, one hundred eighty-five".