201221112312 has 48 divisors (see below), whose sum is σ = 594516925080. Its totient is φ = 60976094400.

The previous prime is 201221112311. The next prime is 201221112331. The reversal of 201221112312 is 213211122102.

201221112312 is a `hidden beast` number, since 20 + 1 + 221 + 112 + 312 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201221112311) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 127032739 + ... + 127034322.

Almost surely, 2^201221112312 is an apocalyptic number.

201221112312 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

201221112312 is an abundant number, since it is smaller than the sum of its proper divisors (393295812768).

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

201221112312 is a wasteful number, since it uses less digits than its factorization.

201221112312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254067084 (or 254067077 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 201221112312 its reverse (213211122102), we get a palindrome (414432234414).

The spelling of 201221112312 in words is "two hundred one billion, two hundred twenty-one million, one hundred twelve thousand, three hundred twelve".