201343021 has 4 divisors (see below), whose sum is σ = 219646944. Its totient is φ = 183039100.

The previous prime is 201343013. The next prime is 201343031. The reversal of 201343021 is 120343102.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 201343021 - 2³ = 201343013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 201342986 and 201343004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201343001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9151945 + ... + 9151966.

It is an arithmetic number, because the mean of its divisors is an integer number (54911736).

Almost surely, 2^201343021 is an apocalyptic number.

It is an amenable number.

201343021 is a deficient number, since it is larger than the sum of its proper divisors (18303923).

201343021 is a wasteful number, since it uses less digits than its factorization.

201343021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18303922.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 201343021 is about 14189.5391398030. The cubic root of 201343021 is about 586.1096342300.

Adding to 201343021 its reverse (120343102), we get a palindrome (321686123).

The spelling of 201343021 in words is "two hundred one million, three hundred forty-three thousand, twenty-one".