21212103201 has 16 divisors (see below), whose sum is σ = 28521857280. Its totient is φ = 14022130320.

The previous prime is 21212103191. The next prime is 21212103223. The reversal of 21212103201 is 10230121212.

It is not a de Polignac number, because 21212103201 - 2⁶ = 21212103137 is a prime.

It is a super-3 number, since 3×21212103201³ (a number of 32 digits) contains 333 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21212103251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 306826 + ... + 369548.

It is an arithmetic number, because the mean of its divisors is an integer number (1782616080).

Almost surely, 2^21212103201 is an apocalyptic number.

It is an amenable number.

21212103201 is a deficient number, since it is larger than the sum of its proper divisors (7309754079).

21212103201 is a wasteful number, since it uses less digits than its factorization.

21212103201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63676.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21212103201 its reverse (10230121212), we get a palindrome (31442224413).

The spelling of 21212103201 in words is "twenty-one billion, two hundred twelve million, one hundred three thousand, two hundred one".