231100134100020 has 144 divisors (see below), whose sum is σ = 725201756370000. Its totient is φ = 59499553591296.

The previous prime is 231100134100001. The next prime is 231100134100111. The reversal of 231100134100020 is 20001431001132.

231100134100020 is a `hidden beast` number, since 231 + 1 + 0 + 0 + 1 + 3 + 410 + 0 + 0 + 20 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 85742340400656 + 145357793699364 = 9259716^2 + 12056442^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 231100134099966 and 231100134100002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 150663906 + ... + 152190054.

It is an arithmetic number, because the mean of its divisors is an integer number (5036123308125).

Almost surely, 2^{231100134100020} is an apocalyptic number.

231100134100020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231100134100020 is an abundant number, since it is smaller than the sum of its proper divisors (494101622269980).

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

231100134100020 is a wasteful number, since it uses less digits than its factorization.

231100134100020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1555202 (or 1555197 counting only the distinct ones).

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

Adding to 231100134100020 its reverse (20001431001132), we get a palindrome (251101565101152).

The spelling of 231100134100020 in words is "two hundred thirty-one trillion, one hundred billion, one hundred thirty-four million, one hundred thousand, twenty".