9921213201 has 4 divisors (see below), whose sum is σ = 13228284272. Its totient is φ = 6614142132.

The previous prime is 9921213199. The next prime is 9921213283. The reversal of 9921213201 is 1023121299.

9921213201 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 not a de Polignac number, because 9921213201 - 2¹ = 9921213199 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9921214201) 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, 1653535531 + ... + 1653535536.

It is an arithmetic number, because the mean of its divisors is an integer number (3307071068).

Almost surely, 2^9921213201 is an apocalyptic number.

It is an amenable number.

9921213201 is a deficient number, since it is larger than the sum of its proper divisors (3307071071).

9921213201 is a wasteful number, since it uses less digits than its factorization.

9921213201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3307071070.

The product of its (nonzero) digits is 1944, while the sum is 30.

The square root of 9921213201 is about 99605.2870132906. The cubic root of 9921213201 is about 2148.7617316069.

The spelling of 9921213201 in words is "nine billion, nine hundred twenty-one million, two hundred thirteen thousand, two hundred one".