201321612 has 36 divisors (see below), whose sum is σ = 527746856. Its totient is φ = 67106880.

The previous prime is 201321611. The next prime is 201321619. The reversal of 201321612 is 216123102.

201321612 is a `hidden beast` number, since 20 + 1 + 32 + 1 + 612 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a hoax number, since the sum of its digits (18) coincides with the sum of the digits of its distinct prime factors.

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

It is not an unprimeable number, because it can be changed into a prime (201321611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 102589 + ... + 104532.

Almost surely, 2^201321612 is an apocalyptic number.

It is an amenable number.

201321612 is an abundant number, since it is smaller than the sum of its proper divisors (326425244).

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

201321612 is a wasteful number, since it uses less digits than its factorization.

201321612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207140 (or 207126 counting only the distinct ones).

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

The square root of 201321612 is about 14188.7847259728. The cubic root of 201321612 is about 586.0888596238.

Adding to 201321612 its reverse (216123102), we get a palindrome (417444714).

The spelling of 201321612 in words is "two hundred one million, three hundred twenty-one thousand, six hundred twelve".