21210100212011 has 4 divisors (see below), whose sum is σ = 21257338743000. Its totient is φ = 21162861681024.

The previous prime is 21210100211981. The next prime is 21210100212019. The reversal of 21210100212011 is 11021200101212.

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

It is a cyclic number.

It is not a de Polignac number, because 21210100212011 - 2²² = 21210096017707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21210100212019) 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, 23619264821 + ... + 23619265718.

It is an arithmetic number, because the mean of its divisors is an integer number (5314334685750).

Almost surely, 2^{21210100212011} is an apocalyptic number.

21210100212011 is a deficient number, since it is larger than the sum of its proper divisors (47238530989).

21210100212011 is an equidigital number, since it uses as much as digits as its factorization.

21210100212011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47238530988.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21210100212011 its reverse (11021200101212), we get a palindrome (32231300313223).

The spelling of 21210100212011 in words is "twenty-one trillion, two hundred ten billion, one hundred million, two hundred twelve thousand, eleven".