1231500112221 has 32 divisors (see below), whose sum is σ = 1655654193792. Its totient is φ = 814203740160.

The previous prime is 1231500112217. The next prime is 1231500112259. The reversal of 1231500112221 is 1222110051321.

It is not a de Polignac number, because 1231500112221 - 2² = 1231500112217 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231500112261) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 321286921 + ... + 321290753.

It is an arithmetic number, because the mean of its divisors is an integer number (51739193556).

Almost surely, 2^{1231500112221} is an apocalyptic number.

It is an amenable number.

1231500112221 is a deficient number, since it is larger than the sum of its proper divisors (424154081571).

1231500112221 is a wasteful number, since it uses less digits than its factorization.

1231500112221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5613.

The product of its (nonzero) digits is 240, while the sum is 21.

Adding to 1231500112221 its reverse (1222110051321), we get a palindrome (2453610163542).

The spelling of 1231500112221 in words is "one trillion, two hundred thirty-one billion, five hundred million, one hundred twelve thousand, two hundred twenty-one".