201221688 has 32 divisors (see below), whose sum is σ = 516652560. Its totient is φ = 65260800.

The previous prime is 201221659. The next prime is 201221693. The reversal of 201221688 is 886122102.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 112413 + ... + 114188.

Almost surely, 2^201221688 is an apocalyptic number.

It is an amenable number.

201221688 is an abundant number, since it is smaller than the sum of its proper divisors (315430872).

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

201221688 is a wasteful number, since it uses less digits than its factorization.

201221688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226647 (or 226643 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 30.

The square root of 201221688 is about 14185.2630571308. The cubic root of 201221688 is about 585.9918770982.

The spelling of 201221688 in words is "two hundred one million, two hundred twenty-one thousand, six hundred eighty-eight".