21001112211 has 8 divisors (see below), whose sum is σ = 28002340800. Its totient is φ = 14000312552.

The previous prime is 21001112189. The next prime is 21001112227. The reversal of 21001112211 is 11221110012.

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 21001112211 - 2¹⁷ = 21000981139 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21001112261) 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 7 ways as a sum of consecutive naturals, for example, 33340 + ... + 207638.

It is an arithmetic number, because the mean of its divisors is an integer number (3500292600).

Almost surely, 2^21001112211 is an apocalyptic number.

21001112211 is a deficient number, since it is larger than the sum of its proper divisors (7001228589).

21001112211 is a wasteful number, since it uses less digits than its factorization.

21001112211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214465.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21001112211 its reverse (11221110012), we get a palindrome (32222222223).

It can be divided in two parts, 210011 and 12211, that added together give a palindrome (222222).

The spelling of 21001112211 in words is "twenty-one billion, one million, one hundred twelve thousand, two hundred eleven".