231121320210 has 96 divisors (see below), whose sum is σ = 655795977408. Its totient is φ = 56007884160.

The previous prime is 231121320091. The next prime is 231121320223. The reversal of 231121320210 is 12023121132.

231121320210 is a `hidden beast` number, since 2 + 311 + 21 + 320 + 2 + 10 = 666.

It is a super-2 number, since 2×231121320210² (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 an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 2612664 + ... + 2699676.

It is an arithmetic number, because the mean of its divisors is an integer number (6831208098).

Almost surely, 2^231121320210 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231121320210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (327897988704).

231121320210 is an abundant number, since it is smaller than the sum of its proper divisors (424674657198).

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

231121320210 is a wasteful number, since it uses less digits than its factorization.

231121320210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89720 (or 89717 counting only the distinct ones).

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

Adding to 231121320210 its reverse (12023121132), we get a palindrome (243144441342).

The spelling of 231121320210 in words is "two hundred thirty-one billion, one hundred twenty-one million, three hundred twenty thousand, two hundred ten".