21001112012211 has 8 divisors (see below), whose sum is σ = 28316106084240. Its totient is φ = 13843429640832.

The previous prime is 21001112012047. The next prime is 21001112012269. The reversal of 21001112012211 is 11221021110012.

It is a happy number.

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

It is not a de Polignac number, because 21001112012211 - 2²³ = 21001103623603 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21001112012311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39327924850 + ... + 39327925383.

It is an arithmetic number, because the mean of its divisors is an integer number (3539513260530).

Almost surely, 2^{21001112012211} is an apocalyptic number.

21001112012211 is a deficient number, since it is larger than the sum of its proper divisors (7314994072029).

21001112012211 is an equidigital number, since it uses as much as digits as its factorization.

21001112012211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78655850325.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21001112012211 its reverse (11221021110012), we get a palindrome (32222133122223).

The spelling of 21001112012211 in words is "twenty-one trillion, one billion, one hundred twelve million, twelve thousand, two hundred eleven".