21210011112011 has 4 divisors (see below), whose sum is σ = 21211991331024. Its totient is φ = 21208030893000.

The previous prime is 21210011111963. The next prime is 21210011112089. The reversal of 21210011112011 is 11021111001212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21210011112011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21210011112611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 990093440 + ... + 990114861.

It is an arithmetic number, because the mean of its divisors is an integer number (5302997832756).

Almost surely, 2^{21210011112011} is an apocalyptic number.

21210011112011 is a deficient number, since it is larger than the sum of its proper divisors (1980219013).

21210011112011 is a wasteful number, since it uses less digits than its factorization.

21210011112011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1980219012.

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

Adding to 21210011112011 its reverse (11021111001212), we get a palindrome (32231122113223).

The spelling of 21210011112011 in words is "twenty-one trillion, two hundred ten billion, eleven million, one hundred twelve thousand, eleven".