201200210021 has 4 divisors (see below), whose sum is σ = 201216772332. Its totient is φ = 201183647712.

The previous prime is 201200209949. The next prime is 201200210027. The reversal of 201200210021 is 120012002102.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 100178580100 + 101021629921 = 316510^2 + 317839^2 .

It is a cyclic number.

It is not a de Polignac number, because 201200210021 - 2¹⁰ = 201200208997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201200209984 and 201200210011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201200210027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8262920 + ... + 8287233.

It is an arithmetic number, because the mean of its divisors is an integer number (50304193083).

Almost surely, 2^201200210021 is an apocalyptic number.

It is an amenable number.

201200210021 is a deficient number, since it is larger than the sum of its proper divisors (16562311).

201200210021 is a wasteful number, since it uses less digits than its factorization.

201200210021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16562310.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 201200210021 its reverse (120012002102), we get a palindrome (321212212123).

The spelling of 201200210021 in words is "two hundred one billion, two hundred million, two hundred ten thousand, twenty-one".