21010212201 has 64 divisors (see below), whose sum is σ = 32930758656. Its totient is φ = 11785593600.

The previous prime is 21010212199. The next prime is 21010212257. The reversal of 21010212201 is 10221201012.

It is not a de Polignac number, because 21010212201 - 2¹ = 21010212199 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21010212281) 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 63 ways as a sum of consecutive naturals, for example, 5361895 + ... + 5365811.

It is an arithmetic number, because the mean of its divisors is an integer number (514543104).

Almost surely, 2^21010212201 is an apocalyptic number.

It is an amenable number.

21010212201 is a deficient number, since it is larger than the sum of its proper divisors (11920546455).

21010212201 is a wasteful number, since it uses less digits than its factorization.

21010212201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4182.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21010212201 its reverse (10221201012), we get a palindrome (31231413213).

The spelling of 21010212201 in words is "twenty-one billion, ten million, two hundred twelve thousand, two hundred one".