21100210020211 has 4 divisors (see below), whose sum is σ = 24114525737392. Its totient is φ = 18085894303032.

The previous prime is 21100210020173. The next prime is 21100210020221. The reversal of 21100210020211 is 11202001200112.

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 21100210020211 - 2³⁹ = 20550454206323 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21100210020191 and 21100210020200.

It is not an unprimeable number, because it can be changed into a prime (21100210020221) 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, 1507157858580 + ... + 1507157858593.

It is an arithmetic number, because the mean of its divisors is an integer number (6028631434348).

Almost surely, 2^{21100210020211} is an apocalyptic number.

21100210020211 is a deficient number, since it is larger than the sum of its proper divisors (3014315717181).

21100210020211 is an equidigital number, since it uses as much as digits as its factorization.

21100210020211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3014315717180.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21100210020211 its reverse (11202001200112), we get a palindrome (32302211220323).

The spelling of 21100210020211 in words is "twenty-one trillion, one hundred billion, two hundred ten million, twenty thousand, two hundred eleven".