201021331 has 4 divisors (see below), whose sum is σ = 229738672. Its totient is φ = 172303992.

The previous prime is 201021323. The next prime is 201021367. The reversal of 201021331 is 133120102.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 201021331 - 2³ = 201021323 is a prime.

It is a super-2 number, since 2×201021331² = 80819151034023122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201021631) 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 3 ways as a sum of consecutive naturals, for example, 14358660 + ... + 14358673.

It is an arithmetic number, because the mean of its divisors is an integer number (57434668).

Almost surely, 2^201021331 is an apocalyptic number.

201021331 is a deficient number, since it is larger than the sum of its proper divisors (28717341).

201021331 is an equidigital number, since it uses as much as digits as its factorization.

201021331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28717340.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 201021331 is about 14178.1991451665. The cubic root of 201021331 is about 585.7973212579.

Adding to 201021331 its reverse (133120102), we get a palindrome (334141433).

It can be divided in two parts, 20102 and 1331, that multiplied together give a palindrome (26755762).

The spelling of 201021331 in words is "two hundred one million, twenty-one thousand, three hundred thirty-one".