21211120201 has 8 divisors (see below), whose sum is σ = 22471914024. Its totient is φ = 19951779840.

The previous prime is 21211120199. The next prime is 21211120207. The reversal of 21211120201 is 10202111212.

It can be written as a sum of positive squares in 4 ways, for example, as 4324377600 + 16886742601 = 65760^2 + 129949^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21211120201 - 2¹ = 21211120199 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21211120207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 333240 + ... + 391753.

It is an arithmetic number, because the mean of its divisors is an integer number (2808989253).

Almost surely, 2^21211120201 is an apocalyptic number.

It is an amenable number.

21211120201 is a deficient number, since it is larger than the sum of its proper divisors (1260793823).

21211120201 is a wasteful number, since it uses less digits than its factorization.

21211120201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 726731.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21211120201 its reverse (10202111212), we get a palindrome (31413231413).

The spelling of 21211120201 in words is "twenty-one billion, two hundred eleven million, one hundred twenty thousand, two hundred one".