201021320 has 16 divisors (see below), whose sum is σ = 452298060. Its totient is φ = 80408512.

The previous prime is 201021283. The next prime is 201021323. The reversal of 201021320 is 23120102.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 195832036 + 5189284 = 13994^2 + 2278^2 .

It is not an unprimeable number, because it can be changed into a prime (201021323) 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 3 ways as a sum of consecutive naturals, for example, 2512727 + ... + 2512806.

Almost surely, 2^201021320 is an apocalyptic number.

201021320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201021320 is an abundant number, since it is smaller than the sum of its proper divisors (251276740).

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

201021320 is a wasteful number, since it uses less digits than its factorization.

201021320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5025544 (or 5025540 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 201021320 is about 14178.1987572470. The cubic root of 201021320 is about 585.7973105728.

Adding to 201021320 its reverse (23120102), we get a palindrome (224141422).

The spelling of 201021320 in words is "two hundred one million, twenty-one thousand, three hundred twenty".