201021560 has 64 divisors (see below), whose sum is σ = 469450080. Its totient is φ = 77414400.

The previous prime is 201021559. The next prime is 201021563. The reversal of 201021560 is 65120102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201021563) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 124760 + ... + 126360.

Almost surely, 2^201021560 is an apocalyptic number.

201021560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 201021560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (234725040).

201021560 is an abundant number, since it is smaller than the sum of its proper divisors (268428520).

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

201021560 is a wasteful number, since it uses less digits than its factorization.

201021560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1728 (or 1724 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 201021560 is about 14178.2072209430. The cubic root of 201021560 is about 585.7975437012.

Adding to 201021560 its reverse (65120102), we get a palindrome (266141662).

The spelling of 201021560 in words is "two hundred one million, twenty-one thousand, five hundred sixty".