231311011223100 has 144 divisors (see below), whose sum is σ = 675184247692416. Its totient is φ = 61138048608000.

The previous prime is 231311011223081. The next prime is 231311011223111. The reversal of 231311011223100 is 1322110113132.

It is a super-2 number, since 2×231311011223100² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 28942590 + ... + 36059610.

It is an arithmetic number, because the mean of its divisors is an integer number (4688779497864).

Almost surely, 2^{231311011223100} is an apocalyptic number.

231311011223100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231311011223100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (337592123846208).

231311011223100 is an abundant number, since it is smaller than the sum of its proper divisors (443873236469316).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231311011223100 is a wasteful number, since it uses less digits than its factorization.

231311011223100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7117996 (or 7117989 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 21.

Adding to 231311011223100 its reverse (1322110113132), we get a palindrome (232633121336232).

The spelling of 231311011223100 in words is "two hundred thirty-one trillion, three hundred eleven billion, eleven million, two hundred twenty-three thousand, one hundred".