231212016 has 160 divisors (see below), whose sum is σ = 764871680. Its totient is φ = 65505024.

The previous prime is 231211961. The next prime is 231212057. The reversal of 231212016 is 610212132.

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

It is a self number, because there is not a number n which added to its sum of digits gives 231212016.

It is a congruent number.

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, 474525 + ... + 475011.

It is an arithmetic number, because the mean of its divisors is an integer number (4780448).

Almost surely, 2^231212016 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231212016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (382435840).

231212016 is an abundant number, since it is smaller than the sum of its proper divisors (533659664).

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

231212016 is a wasteful number, since it uses less digits than its factorization.

231212016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 668 (or 656 counting only the distinct ones).

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

The square root of 231212016 is about 15205.6573682298. The cubic root of 231212016 is about 613.7669046271.

Adding to 231212016 its reverse (610212132), we get a palindrome (841424148).

The spelling of 231212016 in words is "two hundred thirty-one million, two hundred twelve thousand, sixteen".