231122213100 has 216 divisors, whose sum is σ = 787786953408. Its totient is φ = 56439244800.

The previous prime is 231122213087. The next prime is 231122213107. The reversal of 231122213100 is 1312221132.

231122213100 is a `hidden beast` number, since 2 + 311 + 22 + 21 + 310 + 0 = 666.

It is a super-2 number, since 2×231122213100² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (231122213107) by changing a digit.

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 71 ways as a sum of consecutive naturals, for example, 361965 + ... + 770235.

Almost surely, 2^231122213100 is an apocalyptic number.

231122213100 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 231122213100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (393893476704).

231122213100 is an abundant number, since it is smaller than the sum of its proper divisors (556664740308).

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

231122213100 is a wasteful number, since it uses less digits than its factorization.

231122213100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408345 (or 408335 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 231122213100 its reverse (1312221132), we get a palindrome (232434434232).

The spelling of 231122213100 in words is "two hundred thirty-one billion, one hundred twenty-two million, two hundred thirteen thousand, one hundred".