201232210021 has 4 divisors (see below), whose sum is σ = 201234028192. Its totient is φ = 201230391852.

The previous prime is 201232210013. The next prime is 201232210027. The reversal of 201232210021 is 120012232102.

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 201232210021 - 2³ = 201232210013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201232209977 and 201232210004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201232210027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 731505 + ... + 968278.

It is an arithmetic number, because the mean of its divisors is an integer number (50308507048).

Almost surely, 2^201232210021 is an apocalyptic number.

It is an amenable number.

201232210021 is a deficient number, since it is larger than the sum of its proper divisors (1818171).

201232210021 is a wasteful number, since it uses less digits than its factorization.

201232210021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1818170.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 201232210021 its reverse (120012232102), we get a palindrome (321244442123).

The spelling of 201232210021 in words is "two hundred one billion, two hundred thirty-two million, two hundred ten thousand, twenty-one".