231311222220 has 96 divisors (see below), whose sum is σ = 698631579072. Its totient is φ = 56845145088.

The previous prime is 231311222201. The next prime is 231311222299. The reversal of 231311222220 is 22222113132.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 236254 + ... + 720026.

It is an arithmetic number, because the mean of its divisors is an integer number (7277412282).

Almost surely, 2^231311222220 is an apocalyptic number.

231311222220 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 231311222220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (349315789536).

231311222220 is an abundant number, since it is smaller than the sum of its proper divisors (467320356852).

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

231311222220 is a wasteful number, since it uses less digits than its factorization.

231311222220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 484411 (or 484409 counting only the distinct ones).

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

Adding to 231311222220 its reverse (22222113132), we get a palindrome (253533335352).

It can be divided in two parts, 2313112 and 22220, that added together give a palindrome (2335332).

The spelling of 231311222220 in words is "two hundred thirty-one billion, three hundred eleven million, two hundred twenty-two thousand, two hundred twenty".