1231221230031 has 16 divisors (see below), whose sum is σ = 1792125321056. Its totient is φ = 747295497216.

The previous prime is 1231221230017. The next prime is 1231221230039. The reversal of 1231221230031 is 1300321221321.

It is not a de Polignac number, because 1231221230031 - 2¹¹ = 1231221227983 is a prime.

It is a super-3 number, since 3×1231221230031³ (a number of 37 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231221230039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 216228490 + ... + 216234183.

It is an arithmetic number, because the mean of its divisors is an integer number (112007832566).

Almost surely, 2^{1231221230031} is an apocalyptic number.

1231221230031 is a deficient number, since it is larger than the sum of its proper divisors (560904091025).

1231221230031 is a wasteful number, since it uses less digits than its factorization.

1231221230031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432462762.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 1231221230031 its reverse (1300321221321), we get a palindrome (2531542451352).

The spelling of 1231221230031 in words is "one trillion, two hundred thirty-one billion, two hundred twenty-one million, two hundred thirty thousand, thirty-one".