231212201220 has 576 divisors, whose sum is σ = 976561238016. Its totient is φ = 44347461120.

The previous prime is 231212201219. The next prime is 231212201251. The reversal of 231212201220 is 22102212132.

231212201220 is a `hidden beast` number, since 2 + 31 + 212 + 201 + 220 = 666.

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 = 231212201193 and 231212201202.

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 191 ways as a sum of consecutive naturals, for example, 4841097 + ... + 4888623.

It is an arithmetic number, because the mean of its divisors is an integer number (1695418816).

Almost surely, 2^231212201220 is an apocalyptic number.

231212201220 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 231212201220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (488280619008).

231212201220 is an abundant number, since it is smaller than the sum of its proper divisors (745349036796).

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

231212201220 is a wasteful number, since it uses less digits than its factorization.

231212201220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47582 (or 47568 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 231212201220 its reverse (22102212132), we get a palindrome (253314413352).

The spelling of 231212201220 in words is "two hundred thirty-one billion, two hundred twelve million, two hundred one thousand, two hundred twenty".