21010020211 has 8 divisors (see below), whose sum is σ = 21207586400. Its totient is φ = 20812541760.

The previous prime is 21010020179. The next prime is 21010020223. The reversal of 21010020211 is 11202001012.

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 21010020211 - 2⁵ = 21010020179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21010021211) 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, 522226 + ... + 561016.

It is an arithmetic number, because the mean of its divisors is an integer number (2650948300).

Almost surely, 2^21010020211 is an apocalyptic number.

21010020211 is a deficient number, since it is larger than the sum of its proper divisors (197566189).

21010020211 is a wasteful number, since it uses less digits than its factorization.

21010020211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43869.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21010020211 its reverse (11202001012), we get a palindrome (32212021223).

The spelling of 21010020211 in words is "twenty-one billion, ten million, twenty thousand, two hundred eleven".