231212321220 has 24 divisors (see below), whose sum is σ = 647394499584. Its totient is φ = 61656618976.

The previous prime is 231212321201. The next prime is 231212321233. The reversal of 231212321220 is 22123212132.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1926769284 + ... + 1926769403.

It is an arithmetic number, because the mean of its divisors is an integer number (26974770816).

Almost surely, 2^231212321220 is an apocalyptic number.

231212321220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231212321220 is an abundant number, since it is smaller than the sum of its proper divisors (416182178364).

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

231212321220 is a wasteful number, since it uses less digits than its factorization.

231212321220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3853538699 (or 3853538697 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 231212321220 its reverse (22123212132), we get a palindrome (253335533352).

The spelling of 231212321220 in words is "two hundred thirty-one billion, two hundred twelve million, three hundred twenty-one thousand, two hundred twenty".