21211010011211 has 16 divisors (see below), whose sum is σ = 21478754315808. Its totient is φ = 20944418880000.

The previous prime is 21211010011151. The next prime is 21211010011237. The reversal of 21211010011211 is 11211001011212.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21211010011211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21211010011291) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 212053736 + ... + 212153738.

It is an arithmetic number, because the mean of its divisors is an integer number (1342422144738).

Almost surely, 2^{21211010011211} is an apocalyptic number.

21211010011211 is a deficient number, since it is larger than the sum of its proper divisors (267744304597).

21211010011211 is a wasteful number, since it uses less digits than its factorization.

21211010011211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105742.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 21211010011211 its reverse (11211001011212), we get a palindrome (32422011022423).

The spelling of 21211010011211 in words is "twenty-one trillion, two hundred eleven billion, ten million, eleven thousand, two hundred eleven".