231212111000 has 96 divisors (see below), whose sum is σ = 585856346400. Its totient is φ = 85370563200.

The previous prime is 231212110979. The next prime is 231212111003. The reversal of 231212111000 is 111212132.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231212111003) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 515060 + ... + 853059.

It is an arithmetic number, because the mean of its divisors is an integer number (6102670275).

Almost surely, 2^231212111000 is an apocalyptic number.

231212111000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231212111000 is an abundant number, since it is smaller than the sum of its proper divisors (354644235400).

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

231212111000 is a wasteful number, since it uses less digits than its factorization.

231212111000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1368166 (or 1368139 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 231212111000 its reverse (111212132), we get a palindrome (231323323132).

The spelling of 231212111000 in words is "two hundred thirty-one billion, two hundred twelve million, one hundred eleven thousand".