21201011211 has 8 divisors (see below), whose sum is σ = 29032015504. Its totient is φ = 13752007200.

The previous prime is 21201011173. The next prime is 21201011213. The reversal of 21201011211 is 11211010212.

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

It is not a de Polignac number, because 21201011211 - 2¹⁷ = 21200880139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21201011213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 95499940 + ... + 95500161.

It is an arithmetic number, because the mean of its divisors is an integer number (3629001938).

Almost surely, 2^21201011211 is an apocalyptic number.

21201011211 is a deficient number, since it is larger than the sum of its proper divisors (7831004293).

21201011211 is a wasteful number, since it uses less digits than its factorization.

21201011211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191000141.

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

Adding to 21201011211 its reverse (11211010212), we get a palindrome (32412021423).

Subtracting from 21201011211 its reverse (11211010212), we obtain a palindrome (9990000999).

The spelling of 21201011211 in words is "twenty-one billion, two hundred one million, eleven thousand, two hundred eleven".