31212112230 has 384 divisors, whose sum is σ = 93694648320. Its totient is φ = 7153920000.

The previous prime is 31212112223. The next prime is 31212112273. The reversal of 31212112230 is 3221121213.

31212112230 is a `hidden beast` number, since 312 + 12 + 112 + 230 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 206702655 + ... + 206702805.

It is an arithmetic number, because the mean of its divisors is an integer number (243996480).

Almost surely, 2^31212112230 is an apocalyptic number.

31212112230 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a pronic number, being equal to 176669×176670.

It is a practical number, because each smaller number is the sum of distinct divisors of 31212112230, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46847324160).

31212112230 is an abundant number, since it is smaller than the sum of its proper divisors (62482536090).

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

31212112230 is a wasteful number, since it uses less digits than its factorization.

31212112230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 388 (or 385 counting only the distinct ones).

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

Adding to 31212112230 its reverse (3221121213), we get a palindrome (34433233443).

The spelling of 31212112230 in words is "thirty-one billion, two hundred twelve million, one hundred twelve thousand, two hundred thirty".