21101020211 has 8 divisors (see below), whose sum is σ = 22343570064. Its totient is φ = 19858616320.

The previous prime is 21101020181. The next prime is 21101020229. The reversal of 21101020211 is 11202010112.

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

It is a cyclic number.

It is not a de Polignac number, because 21101020211 - 2⁶ = 21101020147 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21101020192 and 21101020201.

It is not an unprimeable number, because it can be changed into a prime (21101020261) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 436211 + ... + 482163.

It is an arithmetic number, because the mean of its divisors is an integer number (2792946258).

Almost surely, 2^21101020211 is an apocalyptic number.

21101020211 is a deficient number, since it is larger than the sum of its proper divisors (1242549853).

21101020211 is a wasteful number, since it uses less digits than its factorization.

21101020211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72981.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21101020211 its reverse (11202010112), we get a palindrome (32303030323).

The spelling of 21101020211 in words is "twenty-one billion, one hundred one million, twenty thousand, two hundred eleven".