1213131230031 has 32 divisors (see below), whose sum is σ = 1856871295488. Its totient is φ = 690115651200.

The previous prime is 1213131230011. The next prime is 1213131230053. The reversal of 1213131230031 is 1300321313121.

It is a happy number.

It is not a de Polignac number, because 1213131230031 - 2¹³ = 1213131221839 is a prime.

It is a super-2 number, since 2×1213131230031² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213131230011) 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 31 ways as a sum of consecutive naturals, for example, 4223956 + ... + 4502006.

It is an arithmetic number, because the mean of its divisors is an integer number (58027227984).

Almost surely, 2^{1213131230031} is an apocalyptic number.

1213131230031 is a deficient number, since it is larger than the sum of its proper divisors (643740065457).

1213131230031 is a wasteful number, since it uses less digits than its factorization.

1213131230031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278991.

The product of its (nonzero) digits is 324, while the sum is 21.

Adding to 1213131230031 its reverse (1300321313121), we get a palindrome (2513452543152).

The spelling of 1213131230031 in words is "one trillion, two hundred thirteen billion, one hundred thirty-one million, two hundred thirty thousand, thirty-one".